Question

If lactose and glucose are provided in the growth medium of a culture of E. coli ____________

(a) Lactose operon is not transcribed

(b) Lactose metabolism is favored

(c) Both lactose and glucose are metabolized at same rate

(d) Adenylate cyclase is activated

I have been asked this question in a national level competition.

This interesting question is from Principles of Gene Regulation topic in division Regulation of Gene Expression and Miscellaneous of Biochemistry

Answer 1

Correct choice is (a) Lactose operon is not transcribed

To explain I would say: If lactose and glucose are provided in the growth medium of a culture of E. coli lactose operon is not transcribed.