Quantrex Academy Quantrex AcademyPYQs with solutions · JEE · NEET · NDA

Home · JEE Main & Advanced · Chemistry · Biomolecules

Biomolecules — JEE Main & Advanced Chemistry PYQs

493 previous year questions from Biomolecules with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

493 questionsChemistrySolutions on every page
1

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 g

JEE Advanced 2026 Solution View → 2

The correct statement(s) regarding sugars is(are) Given: Specific rotations of L-( - )-glucose and L-( + )-fructose are -52.5^ and +92.5^ , respectively.

JEE Advanced 2026 Solution View → 3

In the following reaction sequence, major products X and Y are acyclic monomers. 500 mol of X completely reacts with 500 mol of Y to give 1 mol of a single biodegradable acyclic co

JEE Advanced 2026 Solution View → 4

The incorrect statement from the following with respect to carbohydrates is:

JEE Main 2026 Solution View → 5

Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?

JEE Main 2026 Solution View → 6

Consider the following reactions. Total number of electrons in the bonds and lone pair of electrons in the product (X) is :

JEE Main 2026 Solution View → 7

Match the List-I with List-II List-I Deficiency Disease List-II Vitamin A. Scurvy I. Pyridoxine B. Convulsions II. Vitamin A C. Cheilosis III. Ascorbic Acid D. Xerophthalmia IV. Ri

JEE Main 2026 Solution View → 8

Match the List-I with List-II 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

JEE Main 2026 Solution View → 9

Sucrose hydrolyses in acidic medium into glucose and fructose by first order rate law with t_ 1/2 = 3 hour. The percentage of sucrose remaining after 6 hours is _______. (Nearest i

JEE Main 2026 Solution View → 10

Identify the incorrect statement about tertiary structure of proteins.

JEE Main 2026 Solution View → 11

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. Stateme

JEE Main 2026 Solution View → 12

Identify the correct statements. A. Glucose exists in two anomeric forms. B. Anomers of glucose differ in configuration at C -1 in cyclic hemiacetal structure. C. Melting point of

JEE Main 2026 Solution View → 13

A D-aldotetrose on oxidation with concentrated HNO₃ resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:

JEE Main 2026 Solution View → 14

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: Lactos

JEE Main 2026 Solution View → 15

Match the List-I with List-II 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-essentia

JEE Main 2026 Solution View → 16

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) Amino ac

JEE Main 2026 Solution View → 17

Match List - I with List - II. List - I Vitamin List - II Name A. Vitamin B₁ I. Pyridoxine B. Vitamin B₂ II. Ascorbic acid C. Vitamin B₆ III. Thiamine D. Vitamin C IV. Riboflavin C

JEE Main 2026 Solution View → 18

Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :

JEE Main 2026 Solution View → 19

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:

JEE Main 2026 Solution View → 20

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:

JEE Main 2026 Solution View → 21

A student is given one compound among the following compounds that gives positive test with Tollen's reagent. The compound is :

JEE Main 2026 Solution View → 22

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

JEE Main 2026 Solution View → 23

From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are :

JEE Main 2026 Solution View → 24

Match List - I with List - II. array l List - I & List - II Reaction of Glucose with & Product formed A. Hydroxylamine & I. Gluconic acid B. Br ₂ water & II. Glucose pentacetate C.

JEE Main 2026 Solution View → 25

Given below are two statements: Statement I : Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorota

JEE Main 2026 Solution View → 26

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

JEE Main 2026 Solution View → 27

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 membere

JEE Main 2026 Solution View → 28

A linear octasaccharide (molar mass =1024 ~g ~mol ⁻¹ ) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed

JEE Advanced 2025 Solution View → 29

Choose the correct option for structures of A and B , respectively.

JEE Main 2025 Solution View → 30

Given below are two statements : Statement (I) : On hydrolysis, oligo peptides give rise to fewer number of -amino acids while proteins give rise to a large number of -amino acids.

JEE Main 2025 Solution View → 31

Given below are two statements: Statement I : D-(+)-glucose + D -(+) fructose - H ₂ O sucrose Statement II : Invert sugar is formed during sucrose hydrolysis. In the light of the a

JEE Main 2025 Solution View → 32

A dipeptide, " x " on complete hydrolysis gives " y " and " z ". " y " on treatment with aq. HNO ₂ produces lactic acid. On the other hand " z " on heating gives the following cycl

JEE Main 2025 Solution View → 33

Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

JEE Main 2025 Solution View → 34

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is_______. 5^ - G - G-C-A-A-A-T-C-G-G-C-T-A-3'

JEE Main 2025 Solution View → 35

Fat soluble vitamins are : A. Vitamin B₁ B. Vitamin C C. Vitamin E D. Vitamin B ₁₂ E. Vitamin K Choose the correct answer from the options given below :

JEE Main 2025 Solution View → 36

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 clo

JEE Main 2025 Solution View → 37

Which of the following is the correct structure of L-fructose?

JEE Main 2025 Solution View → 38

A tetrapeptide " x " on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences)

JEE Main 2025 Solution View → 39

Identify the correct statement among the following:

JEE Main 2025 Solution View → 40

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 :

JEE Main 2025 Solution View → 41

Match List - I with List - II. ( array ll|ll & array l List - I (Carbohydrate) array & array l List - II (Linkage Source) array (A) & Amylose & (I) -C₁-C₄ , plant (B) & Cellulose &

JEE Main 2025 Solution View → 42

Match List - I with List - II. Choose the correct answer from the options given below :

JEE Main 2025 Solution View → 43

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 give

JEE Main 2025 Solution View → 44

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 10

JEE Main 2025 Solution View → 45

Choose the correct answer from the options given below :

JEE Main 2025 Solution View → 46

The carbohydrate "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in -anomeric form Choose the c

JEE Main 2025 Solution View → 47

The -Helix and - Pleated sheet structures of protein are associated with its :

JEE Main 2025 Solution View → 48

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 undergo

JEE Main 2025 Solution View → 49

Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde.

JEE Main 2025 Solution View → 50

Which of the following acids is a vitamin?

JEE Main 2025 Solution View → 51

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 ⁻¹ . [Given: Average en

JEE Advanced 2024 Solution View → 52

The incorrect statement about Glucose is :

JEE Main 2024 Solution View → 53

Total number of essential amino acid among the given list of amino acids is _______ Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline

JEE Main 2024 Solution View → 54

The total number of carbon atoms present in tyrosine, an amino acid, is _______

JEE Main 2024 Solution View → 55

The incorrect statement regarding the given structure is

JEE Main 2024 Solution View → 56

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 glob

JEE Main 2024 Solution View → 57

DNA molecule contains 4 bases whose structure are shown below. One of the structures is not correct, identify the incorrect base structure.

JEE Main 2024 Solution View → 58

Coagulation of egg, on heating is because of :

JEE Main 2024 Solution View → 59

Which of the following gives a positive test with ninhydrin?

JEE Main 2024 Solution View → 60

Match List I with List II ( array |l|l|c|l| & List - I & & List - II A. & - Glucose and - Galactose & I. & Functional isomers B. & - Glucose and - Glucose & II. & Homologous C. & -

JEE Main 2024 Solution View → 61

Vanillin compound obtained from vanilla beans, has total sum of oxygen atoms and ( ) electrons is ______

JEE Main 2024 Solution View → 62

Which of the following is the correct structure of L-Glucose?

JEE Main 2024 Solution View → 63

The number of tripeptides formed by three different amino acids using each amino acid once is _______.

JEE Main 2024 Solution View → 64

If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

JEE Main 2024 Solution View → 65

From the vitamins A , B 1 , B 6 , B 12 , C , D , E and K , the number vitamins that can be stored in our body is ______.

JEE Main 2024 Solution View → 66

Match List I with List II List-I List-II A. Glucose/ NaHCO 3 / ∆ I. Gluconic acid B. Glucose/ HNO 3 II. No reaction C. Glucose/ HI / ∆ III. n -hexane D. Glucose/Bromine water IV. S

JEE Main 2024 Solution View → 67

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 c

JEE Main 2024 Solution View → 68

Sugar which does not give reddish brown precipitate with Fehling's reagent is:

JEE Main 2024 Solution View → 69

Match List I with List II Choose the correct answer from the options given below :-

JEE Main 2024 Solution View → 70

Type of amino acids obtained by hydrolysis of proteins is :

JEE Main 2024 Solution View → 71

Match List I with List I List I (Substances) List II (Element Present) A. Ziegler catalyst I. Rhodium B. Blood Pigment II. Cobalt C. Wilkinson catalyst III. Iron D. Vitamin B12 IV.

JEE Main 2024 Solution View → 72

Which structure of protein remains intact after coagulation of egg white on boiling?

JEE Main 2024 Solution View → 73

Two nucleotides are joined together by a linkage known as :

JEE Main 2024 Solution View → 74

A disaccharide X cannot be oxidised by bromine water. The acid hydrolysis of X leads to a laevorotatory solution. The disaccharide X is

JEE Advanced 2023 Solution View → 75

Which is not true for arginine?

JEE Main 2023 Solution View → 76

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is

JEE Main 2023 Solution View → 77

In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of sp 2 hybridised carbons is _____.

JEE Main 2023 Solution View → 78

The one that does not stabilize 2 ∘ and 3 ∘ structures of proteins is

JEE Main 2023 Solution View → 79

Match List I with List II 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 Choose the corre

JEE Main 2023 Solution View → 80

Sulphur (S) containing amino acids from the following are: (a) isoleucine (b) cysteine (c) lysine (d) methionine (e) glutamic acid

JEE Main 2023 Solution View → 81

Match List-I with List-II. 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 Choose the correc

JEE Main 2023 Solution View → 82

Match List I and List II 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 Choose t

JEE Main 2023 Solution View → 83

All structures given below are of vitamin C . Most stable of them is:

JEE Main 2023 Solution View → 84

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): α -halocarboxylic acid on reaction with dil. NH 3 give

JEE Main 2023 Solution View → 85

The correct representation in six membered pyranose form for the following sugar [ X ] is

JEE Main 2023 Solution View → 86

Match List I and List II List I List II Test Functional group / Class of Compound (A) Molisch's Test (I)Peptide (B) Biuret Test (II)Carbohydrate (C) Carbylamine Test (III) Prim

JEE Main 2023 Solution View → 87

Compound A , C 5 H 10 O 5 , given a tetraacetate with AC 2 O and oxidation of A with Br 2 - H 2 O gives an acid, C 5 H 10 O 6 . Reduction of A with HI gives isopentane. The possibl

JEE Main 2023 Solution View → 88

A protein ‘ X ’ with molecular weight of 70 , 000 u , on hydrolysis gives amino acids. One of these amino acid is

JEE Main 2023 Solution View → 89

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 ar

JEE Main 2023 Solution View → 90

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. R

JEE Main 2023 Solution View → 91

Following tetrapeptide can be represented as ( F , L , D , Y , I , Q , P are one letter codes for amino acids)

JEE Main 2023 Solution View → 92

Number of cyclic tripeptides formed with 2 amino acids A and B is:

JEE Main 2023 Solution View → 93

Match items of Row I with those of Row II. Row I: (P) (Q) (R) (S) Row II: (i) α ‐ D ‐ ( — ) Fructofuranose. (ii) β ‐ D ‐ ( — ) Fructof

JEE Main 2023 Solution View → 94

An athlete is given 100 g of glucose C 6 H 12 O 6 for energy. This is equivalent to 1800 kJ of energy. The 50 % of this energy gained is utilized by the athlete for sports activiti

JEE Main 2023 Solution View → 95

Total number of tripeptides possible by mixing of valine and proline is ________ .

JEE Main 2023 Solution View → 96

Treatment of D -glucose with aqueous NaOH results in a mixture of monosaccharides, which are

JEE Advanced 2022 Solution View → 97

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 lin

JEE Main 2022 Solution View → 98

In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) - (number of peptide bonds) is

JEE Main 2022 Solution View → 99

The formulas of A and B for the following reaction sequence are

JEE Main 2022 Solution View → 100

For the below given cyclic hemiacetal X , the correct pyranose structure is

JEE Main 2022 Solution View → 101

Match List-I with List-II List-I List-II A Glucose + HI I Gluconic acid B Glucose + Br 2 water II Glucose pentacetate C Glucose + acetic anhydride III Saccharic acid D Glucose + HN

JEE Main 2022 Solution View → 102

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 &#39

JEE Main 2022 Solution View → 103

Optical activity of an enantiomeric mixture is + 12 . 6 ° and the specific rotation of + isomer is + 30 ° . The optical purity is____ %

JEE Main 2022 Solution View → 104

Animal starch is the other name of

JEE Main 2022 Solution View → 105

Which of the following is reducing sugar?

JEE Main 2022 Solution View → 106

Glycosidic linkage between C 1 of α -glucose and C 2 of β -fructose is found in

JEE Main 2022 Solution View → 107

During the denaturation of proteins, which of these structures will remain intact ?

JEE Main 2022 Solution View → 108

The structure of protein that is unaffected by heating is :

JEE Main 2022 Solution View → 109

Sugar moiety in DNA and RNA molecules respectively are

JEE Main 2022 Solution View → 110

C 6 H 12 O 6 ⟶ Zymase A → ∆ NaOI B + CHI 3 The number of carbon atoms present in the product B is

JEE Main 2022 Solution View → 111

When sugar ' X ' is boiled with dilute H 2 SO 4 in alcoholic solution, two isomers ' A ' and ' B ' are formed. ' A ' on oxidation with HNO 3 yields

JEE Main 2022 Solution View → 112

2 . 5   g of protein containing only glycine C 2 H 5 NO 2 is dissolved in water to make 500   mL of solution. The osmotic pressure of this solution at 300   K is fou

JEE Main 2022 Solution View → 113

Stability of α - Helix structure of proteins depends upon

JEE Main 2022 Solution View → 114

Given below are two statements. Statement I: Maltose has two α - D - glucose units linked at C 1 and C 4 and is a reducing sugar. Statement II: Maltose has two monosaccharides

JEE Main 2022 Solution View → 115

Which one of the following is a water soluble vitamin, that is not excreted easily?

JEE Main 2022 Solution View → 116

The number of oxygen present in a nucleotide formed from a base, that is present only in RNA is

JEE Main 2022 Solution View → 117

How many of the given compounds will give a positive Biuret test____? Glycine, Glycylalanine, Tripeptide, Biuret

JEE Main 2022 Solution View → 118

In alanylglycylleucylalanylvaline the number of peptide linkages is:

JEE Main 2022 Solution View → 119

A polysaccharide ' X ' on boiling with dil H 2 SO 4 at 393 K under 2 - 3 atm pressure yields ' Y ' ' Y ' on treatment with bromine water gives gluconic acid

JEE Main 2022 Solution View → 120

Given: The compound s , which on reaction with HNO 3 will give the product having degree of rotation, α D = − 52 .7 ° is (are)

JEE Advanced 2021 Solution View →
Practice all Biomolecules questions in the app →