NEET 2026 (Phase 1) · BiologyAmino acids/proteinsPrevious Year Question
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. Choose the correct answer from the options given below:
- A.C and D only
- B.B and C only
- C.A and C only✓
- D.A and B only
Correct Answer
(C) A and C only
Solution & Explanation
Answer: (C) A and C only. Solution: Statement A is correct because amino acids have four substituent groups on the alpha-carbon and are described by NCERT as substituted methanes. Statement C is correct because valine is classified as a neutral amino acid. Statement B is wrong since serine has a hydroxy-methyl R group (alcoholic, not aromatic), and Statement D is wrong since lysine is a basic amino acid, not acidic — so A and C only. NCERT Reference: Ch 9, p.106, line ~8 — "there are acidic (e.g., glutamic acid), basic (lysine) and neutral (valine) amino acids."
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