JEE PYQ Biomolecules - Chapter-wise Questions with Solutions

About Biomolecules PYQs

Biomolecules has 493 previous year questions in the Quantrex Academy JEE Main & Advanced Chemistry bank. The 220 questions in this list come from JEE Main (195) and JEE Advanced (25), spanning 2007 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

JEE Biomolecules PYQs with Solutions

About Biomolecules PYQs

Questions by year (this list)

Biomolecules questions with solutions

A known artificial sweetener X is composed of 4-chloro-4-deoxy- α -D-galactose and 1,6-dichloro-1,6-dideoxy- β -D-fructose joined by a glycosidic linkage. Structure of D-galactose

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

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

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

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

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

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.

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

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

Identify the incorrect statement about tertiary structure of proteins.

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.

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

A D-aldotetrose on oxidation with concentrated HNO_3 resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:

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

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.

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

Match List - I with List - II. List - I Vitamin List - II Name A. Vitamin B_1 I. Pyridoxine B. Vitamin B_2 II. Ascorbic acid C. Vitamin B_6 III. Thiamine D. Vitamin C IV.

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

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:

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

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

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

Match List - I with List - II. List - I List - II Reaction of Glucose with Product formed A. Hydroxylamine I. Gluconic acid B. Br_ 2 water II. Glucose pentacetate C. Excess acetic

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

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

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

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

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

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

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 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

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

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'

Fat soluble vitamins are : A. Vitamin B_1 B. Vitamin C C. Vitamin E D. Vitamin B_ 12 E. Vitamin K Choose the correct answer from the options given below :

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

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

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

Identify the correct statement among the following:

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 :

Match List - I with List - II. \( array l List - I (Carbohydrate) array array l List - II (Linkage Source) array (A) Amylose (I) β-C_1-C_4 , plant (B) Cellulose (II) α-C_1-C_4

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

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

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

Choose the correct answer from the options given below :

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

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

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

Which of the following acids is a vitamin?

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

The incorrect statement about Glucose is :

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

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

The incorrect statement regarding the given structure 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

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

Coagulation of egg, on heating is because of :

Which of the following gives a positive test with ninhydrin?

Match List I with List II \( List - I List - II A. α - Glucose and α - Galactose I. Functional isomers B. α - Glucose and β - Glucose II. Homologous C. α - Glucose and α

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

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

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:

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 ______.

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

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

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

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

Type of amino acids obtained by hydrolysis of proteins is :

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

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

Two nucleotides are joined together by a linkage known as :

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

Which is not true for arginine?

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

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)

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

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.

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

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

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