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【单选题】
关于酶的活性中心,叙述错误的是A.
酶与底物接触只限于酶分子上与酶活性密切相关的较小区域
B.
必需基团可位于活性中心区域之内，也可位于活性中心之外
C.
当底物分子与酶分子相接触时，可引起酶活性中心的构象改变
D.
酶的活性中心一定位于肽链上一级结构相近的区域
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