Carbohydrates & Biomolecules — JEE Main PYQs & Practice Questions

Carbohydrates & Biomolecules is a Chemistry chapter in the JEE Main syllabus. This page brings together 159 previous-year and practice questions on Carbohydrates & Biomolecules, organised into 5 topics: Carbohydrates, Amino Acids and Proteins, Enzymes, Vitamins and Nucleic Acids. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Carbohydrates & Biomolecules JEE Main PYQs as a free PDF (with answer key)

Revise this chapter: Revision notes · Formula sheet

Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Carbohydrates

• A non-reducing sugar "A" hydrolyses to give two reducing mono saccharides. Sugar A is
• Match List-I with List-II. List - I (Saccharides) | List - II (Glycosidic-linkages…
• Which of the following statement is not true for glucose?
• Given below are two statements : Statement I : The structure of Maltose is given below…
• Glycosidic linkage between C₁ of α-glucose and C₂ of β-fructose is found in
• L-isomer of a compound 'A' (C₄H₈O₄) gives a positive test with [Ag(NH₃)₂]⁺. Treatment of…
• Identify the number of structure/s from the following which can be corelated to…
• From the given following (A to D) cyclic structures, those which will not react with…
• Which of the following is the correct structure of L-Fructose?
• Match List - I with Match List - II. List - I | List - II; (A) | Glucose + HI | (I) |…
• Hydrolysis of sucrose gives :
• Identify the incorrect statement from the following
• Two monomers in maltose are :
• Which of the following is the correct structure of L-Glucose?
• Which of the glycosidic linkage between galactose and glucose is present in lactose?
• What are the functional groups present in the structure of maltose?
• Given below are two statements : one is labelled as Assertion (A) and the other is…
• When sugar 'X' is boiled with dilute H₂SO₄ in alcoholic solution, two isomers 'A' and…
• Given below are two statements : Statement I : Sucrose is dextrorotatory. However…
• Maltose is a reducing sugar but sucrose is not.

Amino Acids and Proteins

• The naturally occurring amino acid that contains only one basic functional group in its…
• A protein 'X' with molecular weight of 70,000 u, on hydrolysis gives amino acids. One of…
• The number of essential amino acids in humans is x.
• During the denaturation of proteins, which of these structures will remain intact?
• A peptide synthesized by the reactions of one molecule each of Glycine, Leucine…
• Stability of α-Helix structure of proteins depends upon
• In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of sp²…
• The secondary structure of protein is stabilised by:
• The correct statements are : A. Activation energy for enzyme catalysed hydrolysis of…
• Which of the following gives a positive test with ninhydrin ?
• Identify the correct statements. A. Arginine and Tryptophan are essential amino acids…
• Total number of essential amino acid among the given list of amino acids is ________…
• How many of the given compounds will give a positive Biuret test ____________ ? Glycine…
• The water soluble protein is :
• Given below are two statements : Statement (I) : On hydrolysis, oligo peptides give rise…
• Number of compounds among the following which contain sulphur as heteroatom is…
• Sulphur (S) containing amino acids from the following are: (a) isoleucine (b) cysteine…
• The number of possible tripeptides formed involving alanine (ala), glycine (gly) and…
• Total number of tripeptides possible by mixing of valine and proline is ___________
• Identify the correct statement among the following :

Enzymes

• The incorrect statements regarding enzymes are : (A) Enzymes are biocatalysts. (B)…
• Which one of the following statements is not true about enzymes?
• Match List I with List II List - I | List -II; A. | Zymase | I. | Stomach; B. | Diastase…
• The variation of the rate of an enzyme catalyzed reaction with substrate concentration…
• Enzymes are:
• Match List-I with List-II List - I Enzyne | List - II Conversion of; A. | Invertase | I…
• C₁₂H₂₂O₁₁ + H₂O→(Enzyme A) C₆H₁₂O₆_(Glu cos e) + C₆H₁₂O₆_(Fructose) C₆H₁₂O₆_(Glu cos e)…
• Match List I with List II LIST I Enzymatic reaction | LIST II Enzyme; A. | Sucrose →…

Vitamins

• Deficiency of vitamin K causes :
• Match List - I with List - II. List - I Vitamin | List - II Name; A | Vitamin B₁ | I |…
• Which one of the following is a water soluble vitamin, that is not excreted easily?
• All structures given below are of vitamin C. Most stable of them is :
• Which vitamin is water-soluble and acts as a coenzyme in oxidation-reduction reactions?
• Fat soluble vitamins are: A. Vitamin B₁ B. Vitamin C C. Vitamin E D. Vitamin B 12 E…
• Vitamin C deficiency causes scurvy.
• Thiamine and pyridoxine are also known respectively as :
• Vitamin B₁₂ (cobalamin) contains cobalt. Its deficiency causes x (disease name).
• Match the List-I with List-II List-I Deficiency Disease | List-I Vitamin; A. | Scurvy |…
• Which of the following acids is a vitamin ?
• From the vitamins A, B₁, B₆, B₁₂, C, D, E and K, the number of vitamins that can be…
• Match the following : (i) Riboflavin (a) Beriberi (ii) Thiamine (b) Scurvy (iii)…
• Which among the following pairs of Vitamins is stored in our body relatively for longer…
• Which of the following vitamin is helpful in delaying the blood clotting?
• Match List I with List II LIST I Vitamin | LIST II Deficiency disease; A. | Vitamin A |…

Nucleic Acids

• The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the…
• Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to…
• Sugar moiety in DNA and RNA molecules respectively are
• The compound 'A' is a complementary base of _______________ in DNA stands.
• The sugar in RNA is:
• The number of oxygens present in a nucleotide formed from a base, that is present only…
• The number of hydrogen bonds between A and T in DNA is x.
• Two nucleotides are joined together by a linkage known as :
• The sugar produced after complete hydrolysis of DNA is
• The total number of correct statements, regarding the nucleic acids is _________. A. RNA…
• The base that is NOT present in DNA is:
• DNA is double-stranded while RNA is single-stranded.
• If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary…
• Which one of the following is correct structure for cytosine?
• Out of following isomeric forms of uracil, which one is present in RNA?
• DNA molecule contains 4 bases whose structure are shown below. One of the structures is…

More Chemistry chapters

• Mole Concept & Stoichiometry
• Atomic Structure
• Gaseous State
• Chemical Thermodynamics
• Chemical Equilibrium
• Ionic Equilibrium
• Redox Reactions
• Solutions & Colligative Properties
• Electrochemistry
• Chemical Kinetics
• Solid State
• Surface Chemistry
• Nuclear & Radiochemistry
• Periodic Table & Periodicity
• Chemical Bonding & Molecular Structure
• Hydrogen & s-Block Elements
• p-Block Elements — Part I (Group 13 & 14)
• Environmental Chemistry
• p-Block Elements — Part II (Group 15-18)
• d & f Block Elements
• Coordination Compounds
• Metallurgy
• Qualitative Analysis — Salt Analysis
• Purification & Characterisation of Organic Compounds
• General Organic Chemistry (GOC)
• Hydrocarbons — Alkanes
• Hydrocarbons — Alkenes & Alkynes
• Hydrocarbons — Aromatic (Arenes)
• Halogen Derivatives — Haloalkanes & Haloarenes
• Alcohols, Phenols & Ethers
• Aldehydes & Ketones
• Carboxylic Acids & Their Derivatives
• Amines & Diazonium Salts
• Polymers
• Chemistry in Everyday Life
• Practical Organic Chemistry

Frequently asked questions

How many Carbohydrates & Biomolecules questions are there for JEE Main?

PrepWiser has 159 Carbohydrates & Biomolecules questions for JEE Main, grouped into 5 topics such as Carbohydrates, Amino Acids and Proteins and Enzymes.

Are these Carbohydrates & Biomolecules questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Carbohydrates & Biomolecules questions?

Open any Carbohydrates & Biomolecules question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.