阿摩線上測驗
6. 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
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統計： A(0), B(3), C(0), D(0), E(0) #3506956
統計： A(0), B(3), C(0), D(0), E(0) #3506956
