試題詳解

42. How many of the following about bacterial gene regulation is/are correct? I. Tryptophan acts as a repressor in trp operon. II. Allolactose acts as an activator in lac operon. III. Catabolite activator protein (CAP) is activated by allolactose. IV. The lac operon is turned on by an increase in glucose and an increase in cAMP.
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4