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JEE · NEET Previous Year Question

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 center.(E) Cysteine has characteristic feature of side chain as .
Choose the correct answer from the options given below:

Topic: JEE PYQ

Answer: A. Full step-by-step solution below.

  1. A(A) and (D) Only
  2. B(B) and (E) Only
  3. C(C) and (E) Only
  4. D(C) and (D) Only

Correct answer: A

Solution

(a) (A) Arginine and Tryptophan are essential amino acids - True
(B) Histidine contains imidazole ring (heterocyclic ring with N) - Statement is False
(C) Proline has a 5 -membered pyrrolidine ring, not 6 -membered - False
(D) Glycine ( ) has no chiral center ( -carbon has two H atoms) - True
(E) Cysteine side chain is (thiol). is the side chain of Methionine, not Cysteine - False
Correct statements: (A) and (D) only

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