General formula of α-amino acids is H2N-CHR-COOH. The amino acid is Cysteine when -R is

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-CH2SH

-CH2-CH2-S-CH3

-CH2OH

-CHOH-CH3

answer is A.

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Detailed Solution

Cysteine and Methionine are sulphur containing amino acids;Cysteine contains a thiol group-CH2SH;

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