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【单选题】
关于酶活性中心的叙述不正确的是( )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之内，也可位于活性中心之外
C.
一般来说，总是多肽链的一级结构上相邻的几个氨基酸残基相对集中，形成酶的活性中心
D.
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
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