MHT CET 2022 Chemistry question

Which from following amino acids contains sulfur?

(A)Tryptophan
(B)Histidine
(C)Serine
(D)CysteineCorrect

Answer: (D)

Solution

Cysteine is \mathrm{HS{-}CH_2{-}CH(NH_2){-}COOH}; it carries a thiol (–SH) group, so it contains sulfur (the other sulfur-containing standard amino acid is methionine, which is not listed). Hence (D).

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Question ID VK-094406