Which of the following is not an amino acid?

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Question

(D) An amino acid is an organic compound that contains both an amino group $(-NH_2)$ and a carboxylic acid group $(-COOH)$ attached to the same carbon

Vedclass · Accepted Answer

Benzidine

Vedclass · Answer

(D) An amino acid is an organic compound that contains both an amino group $(-NH_2)$ and a carboxylic acid group $(-COOH)$ attached to the same carbon atom (the $\alpha$-carbon).Glycine,Alanine,and Histidine are standard amino acids found in proteins.Benzidine is an aromatic amine with the formula $(C_6H_4NH_2)_2$. It contains two amino groups but lacks a carboxylic acid group,therefore it is not an amino acid.

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