A known artificial sweetener X is composed of 4-chloro-4-deoxy--D-galactose and 1,6-dichloro-1,6-dideoxy--D-fructose joined by a glycosidic linkage. Structure of D-galactose is given below:
The correct structure of X is
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Biomolecules — JEE Previous Year Questions
Every Biomolecules question asked in JEE Main and JEE Advanced across the last 186 papers — 188 questions, each with its correct answer. Free to read, no account needed.
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The correct statement(s) regarding sugars is(are)
Given: Specific rotations of L-()-glucose and L-()-fructose are and , respectively.
- (A)On treatment with , gluconic acid is oxidized to saccharic acid, whereas glucose is not oxidized to saccharic acid.
- (B)Fructose gives a positive Fehling's test because it isomerises to glucose and another aldohexose in the presence of Fehling's reagent.
- (C)Invert sugar is an equimolar mixture of D-glucose and D-fructose formed after hydrolysis of the corresponding disaccharide.
- (D)Specific rotation of invert sugar is .
Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?
- (A)Threonine
- (B)Serine
- (C)Tyrosine
- (D)Cysteine
The incorrect statement from the following with respect to carbohydrates is:
- (A)All monosaccharides are reducing sugars.
- (B)The monosaccharide units obtained from hydrolysis of oligosaccharides are always the same.
- (C)Starch and cellulose are typical examples of polysaccharides, which are very high molecular weight compounds of more than ten monosaccharide units.
- (D)Open chain and cyclic structures co-exist at equilibrium that are responsible for certain properties as in the case of -glucose.
Match the LIST-I (Deficiency Disease) with LIST-II (Vitamin)
Choose the correct answer from the options given below:
| List-I (Deficiency Disease) | List-II (Vitamin) |
|---|---|
| A.Scurvy | I.Pyridoxine |
| B.Convulsions | II.Vitamin A |
| C.Cheilosis | III.Ascorbic Acid |
| D.Xerophthalmia | IV.Riboflavin |
- (A)A-I, B-III, C-II, D-IV
- (B)A-I, B-III, C-IV, D-II
- (C)A-III, B-I, C-IV, D-II
- (D)A-III, B-I, C-II, D-IV
Consider the following reactions. Total number of electrons in the π bonds and lone pair of electrons in the product is :
- (A)12
- (B)16
- (C)14
- (D)18
Match the LIST-I (Amino acid) with LIST-II (Positive reaction/Test for functional group present in side chain of amino acid)
Choose the correct answer from the options given below:
| List-I (Amino acid) | List-II (Positive reaction/Test for functional group present in side chain of amino acid) |
|---|---|
| A.Glutamine | I.Hinsberg's test |
| B.Lysine | II.Neutral FeCl₃ test |
| C.Tyrosine | III.Ceric ammonium nitrate test |
| D.Serine | IV.Hoffman bromamide degradation |
- (A)A-IV, B-II, C-I, D-III
- (B)A-IV, B-I, C-II, D-III
- (C)A-III, B-II, C-I, D-IV
- (D)A-IV, B-I, C-III, D-II
Given below are two statements :
Statement I: The two cyclic forms of D-(+)-glucose (α and β anomers differing at C1 hydroxyl orientation) are two anomers of D-(+)-glucose.
Statement II: The open chain forms of D-glucose and D-fructose contain three similar chiral carbons at C₃, C₄ and C₅.
In the light of the above statements, choose the correct answer from the options given below :
- (A)Both Statement I and Statement II are true
- (B)Both Statement I and Statement II are false
- (C)Statement I is true but Statement II is false
- (D)Statement I is false but Statement II is true
Identify the correct statements.
A. Glucose exists in two anomeric forms.
B. Anomers of glucose differ in configuration at C1 in cyclic hemiacetal structure.
C. Melting point of -anomer of glucose is greater than -anomer.
D. Specific rotation of -anomer is while for -anomer is
E. and -anomers of glucose are prepared by crystallization of saturated glucose solution at 303 K and 371 K respectively.
Choose the correct answer from the options given below:
- (A)A and B Only
- (B)B and C Only
- (C)A, B and D Only
- (D)A, B and E Only
Identify the incorrect statement about tertiary structure of proteins.
- (A)They can be fibrous or globular in structure.
- (B)The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.
- (C)The structure remains intact when exposed to pH changes.
- (D)A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.
Match List-I (Name of amino acid) with List-II (One letter symbol/type).
Choose the correct answer from the options given below:
| List-I (Name of amino acid) | List-II (One letter symbol/type) |
|---|---|
| A.Arginine | I.D/Non-essential |
| B.Aspartic acid | II.R/Essential |
| C.Lysine | III.E/Non-essential |
| D.Glutamic acid | IV.K/Essential |
- (A)A-II, B-I, C-IV, D-III
- (B)A-IV, B-III, C-II, D-I
- (C)A-III, B-IV, C-I, D-II
- (D)A-II, B-IV, C-I, D-III
A D-aldotetrose on oxidation with concentrated resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
Given below are two statements:
Statement I: The structure of Maltose is given below:
Maltose is a non-reducing sugar.
Statement II: The structure of Lactose is given below:
Lactose is a reducing sugar.
In the light of the above statements, choose the correct answer from the options given below
- (A)Both Statement I and Statement II are true
- (B)Both Statement I and Statement II are false
- (C)Statement I is true but Statement II is false
- (D)Statement I is false but Statement II is true
Match List - I (Vitamin) with List - II (Name). Choose the correct answer from the options given below :
| List - I (Vitamin) | List - II (Name) |
|---|---|
| A.Vitamin | I.Pyridoxine |
| B.Vitamin | II.Ascorbic acid |
| C.Vitamin | III.Thiamine |
| D.Vitamin C | IV.Riboflavin |
- (A)A-II, B-I, C-III, D-IV
- (B)A-IV, B-III, C-II, D-I
- (C)A-III, B-IV, C-I, D-II
- (D)A-I, B-III, C-II, D-IV
Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A).
(T and Y represent one letter code for amino acids)
- (A)T Insulin
- (B)T Thyroxine
- (C)Y Thyroxine
- (D)Y Insulin
In the given pentapeptide, find out an essential amino acid (Y) and the sequence present in the pentapeptide:
Choose the correct answer from the options given below:
- (A)Threonine | Ser – Thr – Asp – Gly – Ala
- (B)Serine | Thr – Ser – Asp – Ala – Gly
- (C)Threonine | Thr – Ser – Asp – Gly – Ala
- (D)Serine | Ser – Asp – Thr – Ala – Gly
Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is :
- (A)6
- (B)3
- (C)4
- (D)8
Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of
- (A)Base unit
- (B)Chiral phosphate unit
- (C)D-sugar component
- (D)L-sugar component
From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are :
- (A)B and D
- (B)A and D
- (C)A and B
- (D)B and C
Match List-I with List-II.
Choose the correct answer from the options given below :
| Reaction of glucose with | Product formed |
|---|---|
| A.Hydroxylamine | I.Glouconic acid |
| B. water | II.Glucose pentacetate |
| C.Excess acetic anhydride | III.Saccharic acid |
| D.Concentrated | IV.Glucoxime |
- (A)A-I, B-III, C-IV, D-II
- (B)A-IV, B-I, C-II, D-III
- (C)A-III, B-I, C-IV, D-II
- (D)A-IV, B-III, C-II, D-I
Given below are two statements:
Statement I : Sucrose is dextrorotatory. However sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation.
Statement II : Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose the resulting solution becomes laevorotatory.
In the light of the above statements, choose the correct answer from the options given below.
- (A)Statement I is false but Statement II is true.
- (B)Both Statement I and Statement II are false.
- (C)Both Statement I and Statement II are true.
- (D)Statement I is true but Statement II is false.
Identify the correct statements.
A. Arginine and Tryptophan are essential amino acids.
B. Histidine does not contain heterocyclic ring in its structure.
C. Proline is a six membered cyclic ring amino acid.
D. Glycine does not have chiral centre.
E. Cysteine has characteristic feature of side chain as MeS-CH-CH-.
Choose the correct answer from the options given below:
Option
- (A)C and E Only
- (B)B and E Only
- (C)C and D Only
- (D)A and D Only
The correct statements are:
A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.
B. During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact.
C. Nucleotides are joined together by glycosidic linkage between and carbons of the pentose sugar
D. Quaternary structure of proteins represents overall folding of the polypeptide chain.
Choose the correct answer from the options given below:
- (A)A, C and D Only
- (B)A, B and D Only
- (C)A and B Only
- (D)B and C Only
A linear octasaccharide (molar mass = 1024 g mol) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed is 58.26% (w/w) of the total amount of the monosaccharides produced in the hydrolyzed products. The number of ribose unit(s) present in one molecule of octasaccharide is ______.
Use: Molar mass (in g mol): ribose = 150, 2-deoxyribose = 134, glucose = 180; Atomic mass (in amu) : H = 1, O = 16
Match the compounds in List-I with the appropriate observations in List-II and choose the correct option.
| List-I | List-II |
|---|---|
| P.see figure | 1.Reaction with phenyl diazonium salt gives yellow dye. |
| Q.see figure | 2.Reaction with ninhydrin gives purple color and it also reacts with to give violet color. |
| R.see figure | 3.Reaction with glucose will give corresponding hydrazone. |
| S.see figure | 4.Lassiagne extract of the compound treated with dilute HCl followed by addition of aqueous gives blood red color. |
| 5.After complete hydrolysis, it will give ninhydrin test and it DOES NOT give positive phthalein dye test. |
- (A)P → 1; Q → 5; R → 4: S → 2
- (B)P → 2; Q → 5; R → 1: S → 3
- (C)P → 5; Q → 2; R → 1: S → 4
- (D)P → 2; Q → 1; R → 5: S → 3
For the amino acid shown in the figure, and represent its structures at and , respectively. Choose the correct option for structures of A and B respectively:
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
Given below are two statements:
Statement I: D-(+)-glucose + D-(+)-fructose sucrose; sucrose D-(+)-glucose + D-(+)-fructose.
Statement II: Invert sugar is formed during sucrose hydrolysis.
In the light of the above statements, choose the correct answer from the options given below:
- (A)Both Statement I and Statement II are true
- (B)Statement I is false but Statement II is true
- (C)Statement I is true but Statement II is false
- (D)Both Statement I and Statement II are false
Given below are two statements:
Statement (I): On hydrolysis, oligo peptides give rise to fewer number of α-amino acids while proteins give rise to a large number of β-amino acids.
Statement (II): Natural proteins are denatured by acids which convert the water soluble form of fibrous proteins to their water insoluble form.
In the light of the above statements, choose the most appropriate answer from the options given below:
- (A)Both statement I and statement II are correct
- (B)Statement I is incorrect but Statement II is correct
- (C)Both statement I and statement II are incorrect
- (D)Statement I is correct but Statement II is incorrect
Thyroxine, the hormone, has the structure given in the figure. The percentage of iodine in thyroxine is ______ %. (nearest integer) (Given molar mass in g mol C:12, H:1, O:16, N:14, I:127)
The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is ______.
A dipeptide, "x" on complete hydrolysis gives "y" and "z". "y" on treatment with aq. produces lactic acid. On the other hand "z" on heating gives the following cyclic molecule. Based on the information given, the dipeptide X is:
- (A)valine-glycine
- (B)alanine-glycine
- (C)valine-leucine
- (D)alanine-alanine
Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.
- (A) and
- (B) and
- (C) and
- (D) and
Which of the following is the correct structure of L-fructose? (Choose the correct Fischer projection shown in the figure.)
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
Given below are two statements:
Statement I: Wet cotton clothes made of cellulose based carbohydrate takes comparatively longer time to get dried than wet nylon polymer based clothes.
Statement II: Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes.
In the light of the above statements, choose the correct answer from the options given below:
- (A)Statement I is false but Statement II is true
- (B)Statement I is true but Statement II is false
- (C)Both Statement I and Statement II are true
- (D)Both Statement I and Statement II are false
Fat soluble vitamins are:
A. Vitamin
B. Vitamin C
C. Vitamin E
D. Vitamin
E. Vitamin K
Choose the correct answer from the options given below:
- (A)C & D Only
- (B)A & B Only
- (C)B & C Only
- (D)C & E Only
A tetrapeptide 'x' on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion. The number of possible sequences of these amino acids is:
- (A)16
- (B)32
- (C)8
- (D)24
0.1 mol of the antiviral compound (P) shown in the figure will weigh ______ g. (Given molar mass in g mol: H:1, C:12, N:14, O:16, F:19, I:127)
Identify the correct statement among the following:
- (A)All naturally occurring amino acids except glycine contain one chiral centre.
- (B)All naturally occurring amino acids are optically active.
- (C)Glutamic acid is the only amino acid that contains a –COOH group at the side chain.
- (D)Amino acid cysteine easily undergoes dimerization due to the presence of free SH group.
Match List-I (Carbohydrate) with List-II (Linkage Source). Choose the correct answer from the options given below:
| List-I (Carbohydrate) | List-II (Linkage Source) |
|---|---|
| A.Amylose | I.β-C-C, plant |
| B.Cellulose | II.α-C-C, animal |
| C.Glycogen | III.α-C-C, α-C-C, plant |
| D.Amylopectin | IV.α-C-C, plant |
- (A)(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
- (B)(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
- (C)(A)-(II), (B)-(III), (C)-(I), (D)-(IV)
- (D)(A)-(IV), (B)-(I), (C)-(III), (D)-(II)
Identify the essential amino acids from below: (A) Valine (B) Proline (C) Lysine (D) Threonine (E) Tyrosine. Choose the correct answer from the options given below:
- (A)(A), (C) and (D) only
- (B)(A), (C) and (E) only
- (C)(B), (C) and (E) only
- (D)(C), (D) and (E) only
Identify correct conversion during acidic hydrolysis from the following: (A) starch gives galactose. (B) cane sugar gives equal amount of glucose and fructose. (C) milk sugar gives glucose and galactose. (D) amylopectin gives glucose and fructose. (E) amylose gives only glucose. Choose the correct answer from the options given below:
- (A)(C), (D) and (E) only
- (B)(A), (B) and (C) only
- (C)(B), (C) and (E) only
- (D)(B), (C) and (D) only
Given below are two statements:
Statement I: D-glucose pentaacetate reacts with 2, 4-dinitrophenylhydrazine.
Statement II: Starch, on heating with concentrated sulfuric acid at 100°C and 2-3 atmosphere pressure produces glucose.
In the light of the above statements, choose the correct answer from the options given below:
- (A)Both Statement I and Statement II are false
- (B)Statement I is false but Statement II is true
- (C)Statement I is true but Statement II is false
- (D)Both Statement I and Statement II are true
Match List-I (Saccharides) with List-II (Glycosidic-linkages found). Choose the correct answer from the options given below:
| List-I (Saccharides) | List-II (Glycosidic-linkages found) |
|---|---|
| A.Sucrose | I. |
| B.Maltose | II. and |
| C.Lactose | III. |
| D.Amylopectin | IV. |
- (A)(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
- (B)(A)-(IV), (B)-(II), (C)-(I), (D)-(III)
- (C)(A)-(II), (B)-(IV), (C)-(I), (D)-(III)
- (D)(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
Match List-I (Nucleobase) with List-II (Structure). Choose the correct answer from the options given below:
| List-I (Nucleobase) | List-II (Structure) |
|---|---|
| A.Adenine | I.see figure |
| B.Cytosine | II.see figure |
| C.Thymine | III.see figure |
| D.Uracil | IV.see figure |
- (A)(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
- (B)(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
- (C)(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
- (D)(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
The carbohydrate "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose form C. in "D" configuration D. a reducing sugar, when free E. in α-anomeric form. Choose the correct answer from the options given below :
- (A)A, C and D Only
- (B)A, B and E Only
- (C)B, D and E Only
- (D)A, D and E Only
The -Helix and -Pleated sheet structures of protein are associated with its:
- (A)quaternary structure
- (B)primary structure
- (C)secondary structure
- (D)tertiary structure
Given below are two statements:
Statement I: Fructose does not contain an aldehydic group but still reduces Tollen's reagent.
Statement II: In the presence of base, fructose undergoes rearrangement to give glucose.
In the light of the above statements, choose the correct answer given below:
- (A)Statement I is false but Statement II is true
- (B)Both Statement I and Statement II are true
- (C)Both Statement I and Statement II are false
- (D)Statement I is true but Statement II is false
Which of the following acids is a vitamin?
- (A)Adipic acid
- (B)Aspartic acid
- (C)Ascorbic acid
- (D)Saccharic acid
Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde.
- (A)three
- (B)two
- (C)four
- (D)one
For a double strand DNA, one strand is given below: The amount of energy required to split the double strand DNA into two single strands is ______ kcal mol. [Given: Average energy per H-bond for A-T base pair = 1.0 kcal mol, G-C base pair = 1.5 kcal mol, and A-U base pair = 1.25 kcal mol. Ignore electrostatic repulsion between the phosphate groups.]
Aspartame, an artificial sweetener, is a dipeptide aspartyl phenylalanine methyl ester. The structure of aspartame is
Structure of phenylalanine and aspartic acid are given below.
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Total number of essential amino acid among the given list of amino acids is _____.
Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline
The incorrect statement about Glucose is:
- (A)Glucose is soluble in water because of having aldehyde functional group
- (B)Glucose remains in multiple isomeric form in its aqueous solution
- (C)Glucose is an aldohexose
- (D)Glucose is one of the monomer unit in sucrose
For the given structure (a Fischer projection of an aldohexose, shown), the incorrect statement regarding the given structure is:
- (A)Can be oxidized to a dicarboxylic acid with water
- (B)despite the presence of does not give Schiff's test
- (C)has 4-asymmetric carbon atoms
- (D)will coexist in equilibrium with 2 other cyclic structures
The total number of carbon atoms present in tyrosine, an amino acid, is _______ .
The incorrect statements regarding enzymes are: (A) Enzymes are biocatalysts. (B) Enzymes are non-specific and can catalyse different kinds of reactions. (C) Most Enzymes are globular proteins. (D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose. Choose the correct answer from the option given below:
- (A)(B) and (C)
- (B)(B), (C) and (D)
- (C)(B) and (D)
- (D)(A), (B) and (C)
A DNA molecule contains 4 bases whose structures are shown in the figure. One of the structures is not correct. Identify the incorrect base structure.
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
Coagulation of egg, on heating, is because of:
- (A)Denaturation of protein occurs
- (B)The secondary structure of protein remains unchanged
- (C)Breaking of the peptide linkage in the primary structure of protein occurs
- (D)Biological property of protein remains unchanged
Which of the following gives a positive test with ninhydrin?
- (A)Cellulose
- (B)Starch
- (C)Polyvinyl chloride
- (D)Egg albumin
Match List-I (pairs of monosaccharides) with List-II (the type of relationship between them). Choose the correct answer from the options given below:
| List-I | List-II |
|---|---|
| A.-Glucose and -Galactose | I.Functional isomers |
| B.-Glucose and -Glucose | II.Homologous |
| C.-Glucose and -Fructose | III.Anomers |
| D.-Glucose and -Ribose | IV.Epimers |
- (A)A-III, B-IV, C-II, D-I
- (B)A-III, B-IV, C-I, D-II
- (C)A-IV, B-III, C-I, D-II
- (D)A-IV, B-III, C-II, D-I
Which of the following is the correct structure of L-Glucose?
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
The number of tripeptides formed by three different amino acids using each amino acid once is __________.
If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:
- (A)CATTAGCT
- (B)TACGAAGT
- (C)GTACTTAC
- (D)ATGCGACT
Match List-I (reactions of glucose) with List-II. Choose the correct answer from the options given below:
| List-I | List-II |
|---|---|
| A.Glucose/ | I.Gluconic acid |
| B.Glucose/ | II.No reaction |
| C.Glucose/HI/ | III.n-hexane |
| D.Glucose/Bromine water | IV.Saccharic acid |
- (A)A-IV, B-I, C-III, D-II
- (B)A-II, B-IV, C-III, D-I
- (C)A-III, B-II, C-I, D-IV
- (D)A-I, B-IV, C-III, D-II
From the vitamins A, , , , C, D, E and K, the number of vitamins that can be stored in our body is ______.
Sugar which does not give reddish brown precipitate with Fehling’s reagent is:
- (A)Sucrose
- (B)Lactose
- (C)Glucose
- (D)Maltose
The total number of correct statements, regarding the nucleic acids is ______.
A. RNA is regarded as the reserve of genetic information.
B. DNA molecule self-duplicates during cell division.
C. DNA synthesizes proteins in the cell.
D. The message for the synthesis of particular proteins is present in DNA.
E. Identical DNA strands are transferred to daughter cells.
Number of compounds among the following which contain sulphur as heteroatom is ______ . Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine
Match List I with List II. Choose the correct answer from the options given below:
| List I (Bio Polymer) | List II (Monomer) |
|---|---|
| A.Starch | I.nucleotide |
| B.Cellulose | II.-glucose |
| C.Nucleic acid | III.-glucose |
| D.Protein | IV.-amino acid |
- (A)A-II, B-I, C-III, D-IV
- (B)A-IV, B-II, C-I, D-III
- (C)A-I, B-III, C-II, D-IV
- (D)A-II, B-III, C-I, D-IV
Type of amino acids obtained by hydrolysis of proteins is :
- (A)
- (B)
- (C)
- (D)
Two nucleotides are joined together by a linkage known as:
- (A)Phosphodiester linkage
- (B)Glycosidic linkage
- (C)Disulphide linkage
- (D)Peptide linkage
Which structure of protein remains intact after coagulation of egg white on boiling ?
- (A)Primary
- (B)Tertiary
- (C)Secondary
- (D)Quaternary
A disaccharide cannot be oxidised by bromine water. The acid hydrolysis of leads to a laevorotatory solution. The disaccharide is
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Which is not true for arginine?
- (A)It is a crystalline solid.
- (B)It is associated with more than one values.
- (C)It has a fairly high melting point.
- (D)It has high solubility in benzene.
D--Glyceraldehyde . The products formed in the above reaction are:
- (A)Two optically active products
- (B)One optically active and one meso product
- (C)One optically inactive and one meso product
- (D)Two optically inactive products
The naturally occurring amino acid that contains only one basic functional group in its chemical structure is
- (A)arginine
- (B)lysine
- (C)asparagine
- (D)histidine
In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of sp hybridised carbons is _________.
The number of compounds from the following which will not produce an orange-red precipitate with Benedict's solution is ____. Glucose, maltose, sucrose, ribose, 2-deoxyribose, amylose, lactose.
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: A solution of the product obtained by heating a mole of glycine with a mole of chlorine in presence of red phosphorus generates a chiral carbon atom.
Reason R: A molecule with 2 chiral carbons is always optically active.
In the light of the above statements, choose the correct answer from the options given below:
- (A)A is false but R is true
- (B)A is true but R is false
- (C)Both A and R are true and R is the correct explanation of A
- (D)Both A and R are true and R is NOT the correct explanation of A
L-isomer of tetrose X () gives positive Schiff's test and has two chiral carbons. On acetylation, 'X' yields triacetate. 'X' also undergoes following reactions: 'A' 'X' 'B' (Chiral compound). 'X' is
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
The one that does not stabilize 2° and 3° structures of proteins is
- (A)H-bonding
- (B)–S-S-linkage
- (C)–O-O-linkage
- (D)van der Waals forces
Match List-I (natural amino acid) with List-II (one letter code). Choose the correct answer from the options given below:
| List-I (Natural amino acid) | List-II (One letter code) |
|---|---|
| A.Glutamic acid | I.Q |
| B.Glutamine | II.W |
| C.Tyrosine | III.E |
| D.Tryptophan | IV.Y |
- (A)A-II, B-I, C-IV, D-III
- (B)A-IV, B-III, C-I, D-II
- (C)A-III, B-I, C-IV, D-II
- (D)A-III, B-IV, C-I, D-II
Sulphur (S) containing amino acids from the following are:
(a) isoleucine (b) cysteine (c) lysine (d) methionine (e) glutamic acid
- (A)a, d
- (B)b, d
- (C)b, c, e
- (D)a, b, c
Match List I (Natural Amino acid) with List II (One Letter Code). Choose the correct answer from the options given below:
| List I (Natural Amino acid) | List II (One Letter Code) |
|---|---|
| A.Arginine | I.D |
| B.Aspartic acid | II.N |
| C.Asparagine | III.A |
| D.Alanine | IV.R |
- (A)A-IV, B-I, C-III, D-II
- (B)A-I, B-III, C-IV, D-II
- (C)A-III, B-I, C-II, D-IV
- (D)A-IV, B-I, C-II, D-III
Match List I with List II.
Choose the correct answer from the options given below:
| List I (Vitamin) | List II (Deficiency disease) |
|---|---|
| A.Vitamin A | I.Beri-Beri |
| B.Thiamine | II.Cheilosis |
| C.Ascorbic acid | III.Xerophthalmia |
| D.Riboflavin | IV.Scurvy |
- (A)A-II, B-IV, C-I, D-III
- (B)A-IV, B-II, C-I, D-III
- (C)A-II, B-I, C-IV, D-III
- (D)A-III, B-I, C-IV, D-II
Match List I with List II.
Choose the correct answer from the options given below:
| List I (Enzymatic reaction) | List II (Enzyme) |
|---|---|
| A.Sucrose → Glucose and Fructose | I.Zymase |
| B.Glucose → ethyl alcohol and | II.Pepsin |
| C.Starch → Maltose | III.Invertase |
| D.Proteins → Amino acids | IV.Diastase |
- (A)A-I, B-II, C-III, D-IV
- (B)A-I, B-IV, C-III, D-II
- (C)A-III, B-I, C-IV, D-II
- (D)A-I, B-III, C-IV, D-III
All structures given below are of vitamin C. Most stable of them is:
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
Testosterone, which is a steroidal hormone, has the following structure. The total number of asymmetric carbon atom/s in testosterone is _________
The correct representation in six membered pyranose form for the sugar shown in the figure is:
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
A protein 'X' with molecular weight of 70,000u, on hydrolysis gives amino acids. One of these amino acid is
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
Compound A, , gives a tetraacetate with and oxidation of A with gives an acid, . Reduction of A with HI gives isopentane. The possible structure of A is:
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
A short peptide on complete hydrolysis produces 3 moles of glycine (G), two moles of leucine (L) and two moles of valine (V) per mole of peptide. The number of peptide linkages in it are _______.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Ketoses give Seliwanoff's test faster than Aldoses.
Reason (R): Ketoses undergo -elimination followed by formation of furfural.
In the light of the above statements, choose the correct answer from the options given below:
- (A)(A) is false but (R) is true
- (B)(A) is true but (R) is false
- (C)Both (A) and (R) are true but (R) is not the correct explanation of (A)
- (D)Both (A) and (R) are true and (R) is the correct explanation of (A)
Following tetrapeptide can be represented as:
(F, L, D, Y, I, Q, P are one letter codes for amino acids)
- (A)PLDY
- (B)FIQY
- (C)YQLF
- (D)FLDY
Number of cyclic tripeptides formed with 2 amino acids A and B is:
- (A)5
- (B)2
- (C)4
- (D)3
Match Row-I (Haworth structures shown in the figure) with Row-II (names). Choose the correct match from the options given below:
| Row-I (Haworth structures) | Row-II (Names) |
|---|---|
| A.see figure | i.-D-(−)-Fructofuranose |
| B.see figure | ii.-D-(−)-Fructofuranose |
| C.see figure | iii.-D-(−)-Glucopyranose |
| D.see figure | iv.-D-(−)-Glucopyranose |
- (A)A-i, B-ii, C-iv, D-iii
- (B)A-iv, B-iii, C-i, D-ii
- (C)A-iii, B-ii, C-i, D-i
- (D)A-iii, B-iv, C-i, D-ii
The variation of the rate of an enzyme catalyzed reaction with substrate concentration is correctly represented by which graph (graphs (a), (b), (c), (d) shown in the figure)?
- (A)(b)
- (B)(a)
- (C)(d)
- (D)(c)
Uracil is a base present in RNA. The percentage of nitrogen (by mass) in uracil is _______ .
Total number of tripeptides possible by mixing of valine and proline is _________
Treatment of D-glucose with aqueous NaOH results in a mixture of monosaccharides, which are
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) - (number of peptide bonds) is_______.
Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Amylose is insoluble in water.
Reason R : Amylose is a long linear molecule with more than 200 glucose units.
In the light of the above statements, choose the correct answer from the options given below.
- (A)Both A and R are correct and R is the correct explanation of A.
- (B)Both A and R are correct and R is NOT the correct explanation of A.
- (C)A is correct but R is not correct.
- (D)A is not correct but R is correct.
For the below given cyclic hemiacetal (X), the correct pyranose structure is :
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
The formulas of A and B for the following reaction sequence are
- (A),
- (B),
- (C),
- (D),
Match List-I with List-II
List-I
(A) Glucose + HI
(B) Glucose + Br water
(C) Glucose + acetic anhydride
(D) Glucose + HNO
List-II
(I) Gluconic acid
(II) Glucose pentacetate
(III) Saccharic acid
(IV) Hexane
Choose the correct answer from the options given below:
- (A)(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
- (B)(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
- (C)(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
- (D)(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
A sugar ‘X’ dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar ‘X’ is
- (A)Aldopentose
- (B)Aldotetrose
- (C)Oxalic acid
- (D)Ketotetrose
Which of the following is reducing sugar?
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Animal starch is the other name of :
- (A)amylose
- (B)maltose
- (C)glycogen
- (D)amylopectin
During the denaturation of proteins, which of these structures will remain intact ?
- (A)Primary
- (B)Secondary
- (C)Tertiary
- (D)Quaternary
Sugar moiety in DNA and RNA molecules respectively are
- (A)β-D-2-deoxyribose, β -D-deoxyribose
- (B)β-D-2-deoxyribose, β -D-ribose
- (C)β-D-ribose, β -D-2-deoxyribose
- (D)β-D-deoxyribose, β -D-2-deoxyribose
The structure of protein that is unaffected by heating is :
- (A)secondary structure
- (B)tertiary structure
- (C)primary structure
- (D)quaternary structure
Stability of α - Helix structure of proteins depends upon
- (A)dipolar interaction
- (B)H-bonding interaction
- (C)van der Waals forces
- (D)π -stacking interaction
When sugar 'X' is boiled with dilute HSO in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with HNO yields saccharic acid where as 'B' is laevorotatory. The compound 'X' is :
- (A)Maltose
- (B)Sucrose
- (C)Lactose
- (D)Strach
L-isomer of a compound 'A' () gives a positive test with . Treatment of 'A' with acetic anhydride yield triacetate derivative. Compound 'A' produces an optically active compound (B) and an optically inactive compound (C) on treatment with bromine water and respectively, compound (A) is:
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Given below are two statements.
Statments I: Maltose has two -D-glucose units linked at C and C and is a reducing sugar.
Statement II: Maltose has two monosaccharides: -D-glucose and -D-glucose linked at C and C and it is a non-reducing sugar.
In the light of the above statements, choose the correct answer from the options given below.
- (A)Both Statement I and Statement II are true
- (B)Both Statement I and Statement II are false
- (C)Statement I is true but Statement II is false
- (D)Statement I is false but Statement II is true
Match List I with List II.
Choose the most appropriate answer from the options given below :
| List I (Enzyme) | List II (Conversion of) |
|---|---|
| A.Invertase | I.Starch into maltose |
| B.Zymase | II.Maltose into glucose |
| C.Diastase | III.Glucose into ethanol |
| D.Maltase | IV.Cane sugar into glucose |
- (A)A-III, B-IV, C-II, D-I
- (B)A-III, B-II, C-I, D-IV
- (C)A-IV, B-III, C-I, D-II
- (D)A-IV, B-II, C-III, D-I
Which one of the following is a water soluble vitamin, that is not excreted easily?
- (A)Vitamin
- (B)Vitamin
- (C)Vitamin
- (D)Vitamin
The number of oxygens present in a nucleotide formed from a base, that is present only in RNA is ______.
Match List I with List II.
Choose the correct answer from the options given below:
| List I | List II |
|---|---|
| A.Zymase | I.Stomach |
| B.Diastase | II.Yeast |
| C.Urease | III.Malt |
| D.Pepsin | IV.Soyabean |
- (A)A-II, B-III, C-I, D-IV
- (B)A-II, B-III, C-IV, D-I
- (C)A-III, B-II, C-IV, D-I
- (D)A-III, B-II, C-I, D-IV
How many of the given compounds will give a positive Biuret test ______ ? Glycine, Glycylalanine, Tripeptide, Biuret
A polysaccharide 'X' on boiling with dil HSO at 393 K under 2-3 atm pressure yields 'Y'. 'Y' on treatment with bromine water gives gluconic acid. 'X' contains -glycosidic linkages only. Compound 'X' is :
- (A)starch
- (B)cellulose
- (C)amylose
- (D)amylopectin
In alanylglycylleucylalanylvaline, the number of peptide linkages is_______.
Given
The compound(s), which on reaction with will give the product having degree of rotation, is (are)
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
A peptide synthesized by the reactions of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have ______ peptide linkages.
Which one of the following compounds contains glycosidic linkage ?
- (A)Lactose
- (B)Sucrose
- (C)Maltose
- (D)Amylose
Which of the following is NOT an example of fibrous protein ?
- (A)Keratin
- (B)Albumin
- (C)Collagen
- (D)Myosin
Out of following isomeric forms of uracil, which one is present in RNA ?
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
Hydrolysis of sucrose gives :
- (A)α-D-(–)-Glucose and β-D-(–)-Fructose
- (B)α-D-(+)-Glucose and α-D-(–)-Fructose
- (C)α-D-(–)-Glucose and α-D-(+)-Fructose
- (D)α-D-(+)-Glucose and β-D-(–)-Fructose
Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent ?
- (A)Barfoed's test
- (B)Seliwanoff's test
- (C)Benedict's test
- (D)Biuret test for peptide bond
The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, at pH 12.5 will be _________. (Integer answer)
Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R).
Assertion (A) : Sucrose is a disaccharide and a non-reducing sugar.
Reason (R) : Sucrose involves glycosidic linkage between of -glucose and of -fructose.
Choose the most appropriate answer from the options given below :
- (A)Both (A) and (R) are true but (R) is not the true explanation of (A)
- (B)(A) is false but (R) is true.
- (C)(A) is true but (R) is false
- (D)Both (A) and (R) are true and (R) is the true explanation of (A)
The compound 'A' is a complementary base of ______________ in DNA strands.
- (A)Adenine
- (B)Cytosine
- (C)Guanine
- (D)Uracil
Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide?
- (A)Tollen's test
- (B)Seliwanoff's test
- (C)Iodine test
- (D)Barfoed test
Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is:
- (A)Amylose
- (B)Sucrose
- (C)Maltose
- (D)Lactose
Which one of the following is correct structure for cytosine?
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
The water soluble protein is:
- (A)Myosin
- (B)Collagen
- (C)Fibrin
- (D)Albumin
Thiamine and pyridoxine are also known respectively as :
- (A)Vitamin and Vitamin
- (B)Vitamin E and Vitamin
- (C)Vitamin and Vitamin
- (D)Vitamin and Vitamin E
Identify the incorrect statement from the following:
- (A)β-Glycosidic linkage makes cellulose polymer
- (B)Amylose is a branched chain polymer of glucose
- (C)Starch is a polymer of α- D glucose
- (D)Glycogen is called as animal starch
The correct structure of Rhumann’s Purple, the compound formed in the reaction of ninhydrin with proteins is:
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Which one of the following statements is not true about enzymes ?
- (A)The action of enzymes is temperature and pH specific.
- (B)Enzymes are non-specific for a reaction and substrate.
- (C)Enzymes work as catalysts by lowering the activation energy of a biochemical reaction.
- (D)Almost all enzymes are proteins.
Deficiency of vitamin K causes :
- (A)Increase in blood clotting time
- (B)Increase in fragility of RBC's
- (C)Cheilosis
- (D)Decrease in blood clotting time
A non-reducing sugar "A" hydrolyses to give two reducing mono saccharides. Sugar A is-
- (A)Fructose
- (B)Galactose
- (C)Glucose
- (D)Sucrose
Which of the following is correct structure of tyrosine?
- (A)(1)
- (B)(2)
- (C)(3)
- (D)(4)
Fructose is an example of :-
- (A)Pyranose
- (B)Ketohexose
- (C)Aldohexose
- (D)Heptose
CHO (Sucrose) + HO CHO (Glucose) + CHO (Fructose)
CHO (Glucose) 2CHOH + 2CO
In the above reactions, the enzyme A and enzyme B respectively are :-
- (A)Amylase and Invertase
- (B)Invertase and Amylase
- (C)Invertase and Zymase
- (D)Zymase and Invertase
Which among the following pairs of Vitamins is stored in our body relatively for longer duration ?
- (A)Thiamine and Vitamin A
- (B)Vitamin A and Vitamin D
- (C)Thiamine and Ascorbic acid
- (D)Ascorbic acid and Vitamin D
The secondary structure of protein is stabilised by:
- (A)Peptide bond
- (B)glycosidic bond
- (C)Hydrogen bonding
- (D)van der Waals forces
Match List-I with List-II.
List-I
(a) Sucrose
(b) Lactose
(c) Maltose
List-II
(i) β-D-Galactose and β-D-Glucose
(ii) α-D-Glucose and β-D-Fructose
(iii) α-D- Glucose and α-D-Glucose
Choose the correct answer from the options given below:
- (A)(a)-(iii), (b)-(ii), (c)-(i)
- (B)(a)-(iii), (b)-(i), (c)-(ii)
- (C)(a)-(i), (b)-(iii), (c)-(ii)
- (D)(a)-(ii), (b)-(i), (c)-(iii)
Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ____________ respectively
- (A)ketoses, proteins
- (B)proteins, ketoses
- (C)aldoses, ketoses
- (D)ketoses, aldoses
Which of the glycosidic linkage galactose and glucose is present in lactose?
- (A)C-1 of glucose and C-6 of galactose
- (B)C-1 of galactose and C-4 of glucose
- (C)C-1 of glucose and C-4 of galactose
- (D)C-1 of galactose and C-6 of glucose
Which of the following is correct structure of α-anomer of maltose : H CH2OHOHHCH2OHOOH
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Out of the following, which type of interaction is responsible for the stabilisation −helix structure of proteins ?
- (A)Ionic bonding
- (B)Hydrogen bonding
- (C)vander Waals forces
- (D)Covalent bonding
The structure of a peptide is given below
If the absolute values of the net charge of the peptide at pH = 2, pH = 6, and pH = 11 are , and , respectively, then what is ?
The number of chiral carbons present in sucrose is __________.
The number of chiral carbon(s) present in peptide, Ile-Arg-Pro, is ___
Which of the following is not an essential amino acid?
- (A)Valine
- (B)Tyrosine
- (C)Leucine
- (D)Lysine
Which of the following will react with CHCl + alc. KOH?
- (A)Adenine and proline
- (B)Adenine and lysine
- (C)Adenine and thymine
- (D)Thymine and proline
The number of chiral centres present in threonine is _______.
What are the functional groups present in the structure of maltose?
- (A)One acetal and one hemiacetal
- (B)One ketal and one hemiketal
- (C)One acetal and one ketal
- (D)Two acetals
The number of [structure shown] groups present in a tripeptide Asp – Glu – Lys is ______.
A, B and C are three biomolecules. The results of the tests performed on them are given below:
A, B and C are respectively:
| Molisch's Test | Barfoed Test | Biuret Test | |
|---|---|---|---|
| (A) | Positive | Negative | Negative |
| (B) | Positive | Positive | Negative |
| (C) | Negative | Negative | Positive |
- (A)A = Lactose, B = Glucose, C = Alanine
- (B)A = Lactose, B = Glucose, C = Albumin
- (C)A = Glucose, B = Fructose, C = Albumin
- (D)A = Lactose, B = Fructose, C = Alanine
Which of the following statement is not true for glucose?
- (A)Glucose exists in two crystalline forms and
- (B)Glucose gives Schiff's test for aldehyde
- (C)Glucosse reacts with hydroxylamine to form oxime
- (D)The pentaacetate of glucose does not react with hydroxylamine to give oxime
Two monomers in maltose are:
- (A)-D-glucose and -D-galactose
- (B)-D-glucose and -D-glucose
- (C)-D-glucose and -D-glucose
- (D)-D-glucose and -D-Fructose
Which of the following statements is correct?
- (A)Gluconic acid is a dicarboxylic acid
- (B)Gluconic acid can form cyclic(acetal/hemiacetal) structure
- (C)Gluconic acid is a partial oxidation product of glucose
- (D)Gluconic acid is obtained by oxidation of glucose with
Match the following
| Column – I | Column – II |
|---|---|
| i.Riboflamin | a.Beriberi |
| ii.Thiamine | b.Scurvy |
| iii.Pyridoxine | c.Cheilosis |
| iv.Ascorbic acid | d.Convulsions |
- (A)i → c, ii → a, iii → d, iv → b
- (B)i → c, ii → d, iii → a, iv → b
- (C)i → a, ii → d, iii → c, iv → b
- (D)i → d, ii → b, iii → a, iv → c
Which of the following statements(s) is (are) true ?
- (A)Oxidation of glucose with bromine water gives glutamic acid
- (B)The two six-membered cyclic hemiacetal forms of D-(+)-glucose are called anomers
- (C)Monosaccharides cannot be hydrolysed to give polyhydroxy aldehydes and ketones
- (D)Hydrolysis of sucrose gives dextrorotatory glucose and laevorotatory fructose
Which of the following statements is not true about RNA?
- (A)It has always double stranded α-helix structure
- (B)It is present in the nucleus of the cell
- (C)It controls the synthesis of protein
- (D)It usually does not replicate
Glucose and Galactose are having identical configuration in all the positions except position.
- (A)C-4
- (B)C-3
- (C)C-5
- (D)C-2
Which of the given statements is INCORRECT about glycogen?
- (A)It is present in some yeast and fungi
- (B)It is present in animal cells
- (C)Only α-linkages are present in the molecule
- (D)It is a straight chain polymer similar to amylase
Amylopectin is composed of
- (A)-D-glucose, C-C and C-C linkages
- (B)-D-glucose, C-C and C-C linkages
- (C)-D-glucose, C-C and C-C linkages
- (D)-D-glucose, C-C and C-C linkages
Number of stereo centers present in linear and cyclic structures of glucose are respectively
- (A)4 & 5
- (B)5 & 5
- (C)4 & 4
- (D)5 & 4
The peptide that gives positive ceric ammonium nitrate and carbylamine tests is:
- (A)Lys - Asp
- (B)Ser – Lys
- (C)Gln - Asp
- (D)Asp – Gln
Fructose and glucose can be distinguished by:
- (A)Benedict's test
- (B)Fehling's test
- (C)Barfoed's test
- (D)Seliwanoff's test
The major product in the following reaction is:
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Maltose on treatment with dilute HCl gives:
- (A)D – Fructose
- (B)D – Galactose
- (C)D – Glucose and D – Fructose
- (D)D – Glucose
The correct structure of histidine in a strongly acidic solution (pH = 2) is :
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
Among the following compounds most basic amino acid is
- (A)Asparagine
- (B)Lysine
- (C)Serine
- (D)Histidine
The correct match between Item I and Item II is
| Item I | Item II |
|---|---|
| A.Ester test | P.Tyr |
| B.Carbylamine test | Q.Asp |
| C.Phthalein dye test | R.Ser |
| S.Lys |
- (A)A \u2013 Q, B \u2013 S, C \u2013 P
- (B)A \u2013 R, B \u2013 Q, C \u2013 P
- (C)A \u2013 R, B \u2013 S, C \u2013 Q
- (D)A \u2013 Q, B \u2013 S, C \u2013 R
Among the following compounds, which one is found in RNA?
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
The correct structure of product 'P' in the following reaction is
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
The increasing order of pKa of following amino acids in aqueous solution is
Gly, Asp, Lys, Arg
- (A)Asp < Gly < Arg < Lys
- (B)Gly < Asp < Arg < Lys
- (C)Asp < Gly < Lys < Arg
- (D)Arg < Lys < Gly < Asp
The correct sequence of amino acids present in the tripeptide given below is
- (A)Val – Ser – Thr
- (B)Thr – Ser – Val
- (C)Leu – Ser – Thr
- (D)Thr – Ser – Leu
The Fischer presentation of D-glucose is given below
The correct structures(s) of -L-glucopyranose is(are)
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
For ‘invert sugar’, the correct statement(s) is(are)
(Given: specific rotations of (+)-sucrose, (+)-maltose, L-(–)-glucose and L-(+)-fructose in aqueous solution are +66°, +140°, –52° and +92°, respectively)
- (A)‘invert sugar’ is prepared by acid catalyzed hydrolysis of maltose
- (B)‘invert sugar’ is an equimolar mixture of D-(+)-glucose and D-(–)-fructose
- (C)specific rotation of ‘invert sugar’ is –20°
- (D)on reaction with water, ‘invert sugar’ forms saccharic acid as one of the products
The structure of D-(+)-glucose is
The structure of L-(−)-glucose is
- (A)(A)
- (B)(B)
- (C)(C)
- (D)(D)
The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is
A tetrapeptide has – COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with – NH group attached to a chiral center is
Biomolecules — frequently asked
How many questions from Biomolecules appear in JEE?
Biomolecules has appeared in 162 of the last 186 JEE Main and JEE Advanced papers — about 87% of them — contributing 188 questions in total across those papers.
Is Biomolecules an important chapter for JEE?
Judged by how often it is actually tested, it appears in roughly 87% of papers. Chapters above about 50% are effectively guaranteed to show up every session, so they repay thorough preparation; lower-frequency chapters are better treated as targeted revision.
Where do these Biomolecules questions come from?
Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.
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