(单选题)78: 下列叙述错误的是??( )
A: S-腺苷同型半胱氨酸是甲硫氨酸循环中的中间产物
B: 甲硫氨酸循环是耗能的过程
C: 甲硫氨酸循环需要维生素B12及叶酸参加
D: 甲硫氨酸循环与机体内很多合成代谢有关
E: 经甲硫氨酸循环可合成甲硫氨酸,故甲硫氨酸是非必需氨基酸
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