Question

What happens to E. coli when lactose is not present?

a. The enzymes needed to break down lactose are continually produced.
b. The genes that produce the enzymes needed to break down lactose are not expressed.
c. E. coli is not able to survive without lactose.
d. The genes required to produce the enzymes that break down lactose are destroyed.

Answer 1

When lactose is not present, what happens to E. coli is that the genes that produce the enzymes needed to break down lactose are not expressed. The correct answer is B.