15. There are 20 different amino acids. What makes one amino acid different from another?
(A) Different carboxyl groups attached to an alpha (α) carbon
(B) Different amino groups attached to an alpha (α) carbon
(C) Different side chains (R groups) attached to an alpha (α) carbon
(D) Different alpha (α) carbons
(E) Different asymmetric carbons
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胺基酸之間的差異主要在於它們的側鏈，也稱...
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