問題詳情
39. Regarding prokaryotic gene regulation, what is the function of the lac operon in E. coli?
(A) It codes for enzymes involving in the synthesis of lactose.
(B) It is activated only when lactose is present and glucose is absent, allowing the cell to
metabolize lactose.
(C) It prevents lactose metabolism when glucose is present.
(D) It enhances the binding of RNA polymerase to DNA, regardless of lactose presence.
(E) It is involved in the replication of the bacterial chromosome.
參考答案
答案：B
統計：A:0,B:3,C:0,D:0,E:0
難度：計算中