Which of the following amino acids contain sulphur in its side chains?

Methionine

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Alanine

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Tryptophan

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Phenylalanine

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Solution

The correct option is A Methionine
Methionine and cysteine are the two amino acids which contain sulphur in its side chain. Alanine is neutral amino acids. Tryptophan and Phenylalanine is an aromatic amino acid, they possess a cyclic structure with a straight side chain bearing carboxylic and amino group. Thus, the correct option is A.

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