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【单选题】
有关酶的叙述,哪一项是正确的A.
所有具有催化作用的酶都是蛋白质
B.
酶的活性中心是酶发挥其催化作用的关键部位
C.
所有的酶都含有两条以上多肽链，便于调节
D.
辅酶与酶蛋白形成共价键
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【单选题】Question 40 Choose the appropriate letter A-D and write it in box 40 on your answer sheet. This text is taken from ______.
A.
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B.
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C.
a critical study of the importance of role signs in modern society.
D.
a newspaper article about role changes.
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