80.在E. coli中,cAMP可活化CRP(cAMP receptor protein),使CRP-cAMP結合至CRP site,因此:
(A)促使RNA聚合酶結合,導致lac operon活化,屬正向調控(positive regulation)
(B)抑制repressor活性,使lac operon活化
(C)促進lactose與repressor之結合,使lac operon活化
(D)直接活化lac operon,不需其他因子
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統計: A(514), B(239), C(273), D(77), E(0) #1037466
統計: A(514), B(239), C(273), D(77), E(0) #1037466