NEET Biomolecules PYQs & Practice Questions

10 free NEET Biology questions on Biomolecules, starting with previous year questions (2016–2026). Tap “Show answer” to check each one. No login needed.

Topics: Elemental Composition of Living Organisms · Elements in Living Organisms · Identifying Amino Acids · Zwitterionic Form of Amino Acids · Classification of Sugars - Hexoses · Most Abundant Biomolecule · Proteins as Heteropolymers · Additional Functions of Proteins · Branching in Glycogen · Proteins - Types and Functions · Enzyme Catalytic Cycle · Enzymes and Bond Types Catalyzed

1. Q1NEET 2026Functions of Biomolecules - Matching

   Match List-I with List-II. List-I: A. Starch, B. Antibody, C. Concanavalin, D. Glut-4 List-II: I. Fights infection, II. Energy storage, III. Glucose transport, IV. Lectin Choose the correct answer from the options given below:

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

   Starch functions in energy storage (II). Antibody fights infection (I). Concanavalin A is a lectin (IV). Glut-4 is a glucose transporter protein (III). So A-II, B-I, C-IV, D-III.

2. Q2NEET 2026Elemental Composition of Human Body

   Arrange the following elements in descending order of their contribution to percentage weight of the human body. (a) Oxygen (b) Carbon (c) Hydrogen (d) Nitrogen Choose the correct answer from the options given below:

   • A. (c), (a), (b), (d)
   • B. (b), (c), (d), (a)
   • C. (b), (a), (c), (d)
   • D. (a), (b), (c), (d)
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   Answer: C — (b), (a), (c), (d)

   By percentage weight contribution to the human body, oxygen (~65%) is highest, followed by carbon (~18%), then hydrogen (~10%), then nitrogen (~3%). So the descending order is (a) Oxygen, (b) Carbon, (c) Hydrogen, (d) Nitrogen.

3. Q3NEET 2026Level of protein structure for alpha-helix

   Alpha-helix is found in which level of protein structure?

   • A. Secondary structure
   • B. Primary structure
   • C. Tertiary structure
   • D. Quaternary structure
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   Answer: —

   The alpha-helix is a type of secondary structure of proteins, formed by hydrogen bonding within the polypeptide backbone.

4. Q4NEET 2026Enzyme class identification

   The following reaction depicts the activity of a particular class of enzymes: X-Y (Substrate) --E--> X-Y + C=C (Product, Product). Identify the enzyme class 'E' from the following options:

   • A. Isomerases
   • B. Ligases
   • C. Transferases
   • D. Lyases
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   Answer: B — Ligases

   Lyases catalyse the removal of groups to form double bonds (or addition to double bonds) without hydrolysis, matching the given reaction type.

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5. Q5NEET 2026Correct statements about amino acids

   Which of the following statements are correct regarding amino acids? A. They are substituted methanes. B. Serine is an aromatic amino acid. C. Valine is a neutral amino acid. D. Lysine is an acidic amino acid.

   • A. A and B only
   • B. C and D only
   • C. B and C only
   • D. A and C only
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   Answer: C — B and C only

   Amino acids are substituted methanes (A, true — general structure based on methane). Valine is a neutral (non-polar) amino acid (C, true). Serine is not aromatic (B false); Lysine is basic, not acidic (D false). A and C only.

6. Q6NEET 2026Matching enzyme/protein to category

   Match List I with List II: List I — A. Trypsin, B. Morphine, C. Concanavalin A, D. Collagen. List II — I. Intercellular ground substance, II. Lectin, III. Enzyme, IV. Alkaloid.

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

   Trypsin is an enzyme (III); Morphine is an alkaloid (IV); Concanavalin A is a lectin (II); Collagen is intercellular ground substance/structural protein (I). A-III, B-IV, C-II, D-I.

7. Q7NEET 2026Correct statements about biomolecules

   Identify the correct statements about biomolecules. A. Lipids are generally water soluble. B. Proteins are polypeptides. C. Polysaccharides are long chains of sugars. D. Adenine and guanine are substituted pyrimidines. E. Almost all enzymes are proteins.

   • A. A, B and C only
   • B. B, D and E only
   • C. B, C and E only
   • D. C, D and E only
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   Answer: B — B, D and E only

   B (proteins are polypeptides), C (polysaccharides are sugar chains), and E (most enzymes are proteins) are true. A is false (lipids are generally water-insoluble); D is false (adenine/guanine are purines, not pyrimidines). B, C and E only.

8. Q8NEET 2026Identifying enzyme class from reaction

   The following reaction depicts the activity of a particular class of enzymes: X-Y(Substrate) --E--> X-Y + C=C(Product, Product). Identify the enzyme class 'E' from the following options:

   • A. Isomerases
   • B. Ligases
   • C. Transferases
   • D. Lyases
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   Answer: C — Transferases

   The reaction shows removal of a group to form a double bond without hydrolysis or oxidation — characteristic of lyases.

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9. Q9NEET 2025Enzyme Classification - Transferase

   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

   • A. Hydrolase
   • B. Lyase
   • C. Transferase
   • D. Ligase
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   Answer: B — Lyase

   This reaction shows transfer of a group (G, other than hydrogen) from one substrate to another, which is catalyzed by transferase enzymes.

10. Q10NEET 2025Enzyme Prosthetic Groups

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

    • A. RuBisCo
    • B. Carbonic anhydrase
    • C. Succinate dehydrogenase
    • D. Catalase
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    Answer: C — Succinate dehydrogenase

    Catalase (and peroxidase) have heme as their prosthetic group.