问题描述：
当含有下列结构片段的蛋白质在消化道中水解时,不可能产生的氨基酸是
O O O O H O
|| || || || | ||
-NH-CH-C-N-CH2-C-N-CH-C-N-CH-C-N-CH2-C-
| | | | | |
CH3 H H CH3 H CH2-SH
H H H SH
| | | |
A.H2N-C-COOH B.CH3-C-COOH C.HS-CH2-C-COOH D.CH2-C-COOH
| | | |
H NH2 NH2 NH2
O O O O H O
|| || || || | ||
-NH-CH-C-N-CH2-C-N-CH-C-N-CH-C-N-CH2-C-
| | | | | |
CH3 H H CH3 H CH2-SH
H H H SH
| | | |
A.H2N-C-COOH B.CH3-C-COOH C.HS-CH2-C-COOH D.CH2-C-COOH
| | | |
H NH2 NH2 NH2
问题解答：
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