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Solution


Q.

Identify the correct statement among the following:        [2025]
1 All naturally occurring amino acids except glycine contain one chiral centre.  
2 All naturally occurring amino acids are optically active.  
3 Glutamic acid is the only amino acid that contains a –COOH group at the side chain.  
4 Amino acid, cysteine easily undergo dimerization due to the presence of free SH group.  

Ans.

(4)