Moderate

Indole ring is present in______________?

Correct answer: A. Tryptophan

  • A. Tryptophan
  • B. Valine
  • C. Methionine
  • D. Histidine

Explanation

Tryptophan contains an indole ring, which is a fused benzene-pyrrole structure. Valine is branched-chain, methionine contains sulfur, and histidine contains an imidazole ring.

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