試題詳解

49. Suppose the lac repressor of E. coli is mutated so that it never binds to the operator. Which of the following is true?
(A) Glucose digesting enzymes are never produced.
(B) Lactose digesting enzymes are never produced.
(C) Lactose digesting enzymes are always produced.
(D) The result depends on the concentration of glucose.
(E) None of the above.