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3. Of the 20 standard amino acids, only ______ is not optically active. The reason is that its side chain ______.
(A) alanine； is a simple methyl group
(B) glycine； is a hydrogen atom
(C)glycine； is unbranched
(D) lysine； contains only nitrogen
(E) proline； forms a covalent bond with the amino group



3. Of the 20 standard amino acids, only ..-阿摩線上測驗