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【单选题】
关于同工酶概念的叙述，正确的是（）
A.
是结构相同而存在部位不同的一组酶
B.
是催化相同化学反应而理化性质及免疫学特性不同的一组酶
C.
是催化相同反应而分布不同的一组酶
D.
是催化相同反应的所有酶
E.
所有酶均有同工酶
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