27. Which of the following is true of the lac operon?
1) It is negatively controlled via the lac repressor
2) Lactose is an allosteric regulator of lac repressor
3) Lactose represses the lac operon
4) It is positively controlled via cAMP activator protein (CAP)
5) Glucose has no effect on the regulation of lac operon
(A) 1,3,4
(B) 1,2,4
(C)1,3, 5
(D) 1,2,3
(E) All of the above
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＊乳糖操縱組(lactose opero...
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