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JEE Main · 2026 · 21 Jan 2026 · Shift 1 · Biomolecules

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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 membered cyclic ring amino acid.
D. Glycine does not have chiral centre.
E. Cysteine has characteristic feature of side chain as -.

Choose the correct answer from the options given below:
  1. (A)C and E Only
  2. (B)B and E Only
  3. (C)C and D Only
  4. (D)A and D Only✓ Correct

Answer: (D)

Solution

Arginine and tryptophan are both counted among the essential amino acids, so statement A holds. Histidine carries an imidazole ring, so the claim that it lacks a heterocyclic ring is wrong. Proline is built on a five-membered pyrrolidine ring, not a six-membered one, so that statement is wrong. Glycine, HNCHCOOH, has two identical hydrogens on its -carbon and therefore no stereocentre, so statement D holds. Cysteine's side chain is HSCH, whereas MeSCHCH belongs to methionine, so that statement is wrong. The correct statements are A and D only.

JEE Main · 2026 · 21 Jan 2026 · Shift 1 · Single correct option

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