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【单选题】
cAMP对乳糖操纵子转录的调控作用是通过
A.
cAMP转变为CAP
B.
CAP转变为cAMP
C.
形成cAMP-CAP复合物
D.
葡萄糖分解活跃,使cAMP增加,促进乳糖利用来扩充能源
E.
cAMP是激素作用的第二信使,与转录无关
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