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Class XI · Biology

Biomolecules: NEET MCQ practice

388 practice questions on Biomolecules, including 46 from past NEET papers, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

388

Practice questions

289

Easy

99

Medium

0

Hard

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What Biomolecules covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Chemical constituents of living cells
  • Structure and function of proteins, carbohydrates, lipids, nucleic acids
  • Enzymes- types, properties, enzyme action and nomenclature

Past NEET questions on Biomolecules

Try each one, then open the answer and explanation.

Question 1 · NEET 2025

Match List I with List II. List I List II A. Adenosine I. Nitrogen base B. Adenylic acid II. Nucleotide C. Adenine III. Nucleoside D. Alanine IV. Amino acid Choose the option with all correct matches.

  1. A.A-III, B-IV, C-II, D-I
  2. B.A-III, B-II, C-IV, D-I
  3. C.A-III, B-II, C-I, D-IV
  4. D.A-II, B-III, C-I, D-IV
Show answer

Answer: C. A-III, B-II, C-I, D-IV

Adenosine = nucleoside (sugar + base). Adenylic acid = nucleotide (sugar + base + phosphate). Adenine = nitrogen base. Alanine = amino acid. So A-III, B-II, C-I, D-IV.

Question 2 · NEET 2025

Which one of the following enzymes contains ‘Haem’ as the prosthetic group?

  1. A.RuBisCo
  2. B.Carbonic anhydrase
  3. C.Succinate dehydrogenase
  4. D.Catalase
Show answer

Answer: D. Catalase

Haem is an iron-containing cofactor. Enzymes with haem include catalase and peroxidase. Succinate dehydrogenase contains FAD, not haem. Carbonic anhydrase has zinc. RuBisCo has magnesium.

Question 3 · NEET 2025

The protein portion of an enzyme is called:

  1. A.Cofactor
  2. B.Coenzyme
  3. C.Apoenzyme
  4. D.Prosthetic group
Show answer

Answer: C. Apoenzyme

Enzymes consist of a protein part and possibly a non-protein helper. The protein portion alone is enzymatically inactive and specifically called an apoenzyme.

Question 4 · NEET 2025

Name the class of enzyme that usually catalyze the following reaction: S – G + S# → S + S# – G Where, G → a group other than hydrogen S → a substrate S# → another substrate

  1. A.Hydrolase
  2. B.Lyase
  3. C.Transferase
  4. D.Ligase
Show answer

Answer: C. Transferase

The reaction shows group G moving from S–G to S#, producing S and S#–G. This is group transfer, not hydrolysis or bond cleavage without group transfer, nor synthesis using ATP. Transferases catalyze group transfers between substrates.

Question 5 · NEET 2024

Which of the following are not fatty acids? A. Glutamic acid B. Arachidonic acid C. Palmitic acid D. Lecithin E. Aspartic acid Choose the correct answer from the options given below:

  1. A.C, D and E only
  2. B.A and B only
  3. C.A, D and E only
  4. D.B and C only
Show answer

Answer: C. A, D and E only

First, identify which are fatty acids: arachidonic acid and palmitic acid are fatty acids. Glutamic acid and aspartic acid are amino acids. Lecithin is a phospholipid, not a fatty acid. So non-fatty acids: A, D, E.

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