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【单选题】
下列关于酶活性部位的描述,哪一项是错误的
A.
活性部位是酶分子中直接与底物结合，并发挥催化功能的部位
B.
活性部位的基团按功能可分为两类，一类是结合基团、一类是催化基团
C.
酶活性部位的基团可以是同一条肽链但在一级结构上相距很远的基团
D.
酶活性中心构象是刚性的
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