(D) Glycine $(H_2N-CH_2-COOH)$ contains both an acidic carboxyl group $(-COOH)$ and a basic amino group $(-NH_2)$.In aqueous solution,the proton from

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(D) Glycine $(H_2N-CH_2-COOH)$ contains both an acidic carboxyl group $(-COOH)$ and a basic amino group $(-NH_2)$.In aqueous solution,the proton from the carboxyl group is transferred to the amino group,forming a dipolar ion known as a zwitter ion: $H_3N^{+}-CH_2-COO^{-}$.