Question

Which of the following statements is true regarding the lac operon?

Select one:
a. The lac repressor gene is encoded within the lac operon.
b. The lac repressor binds to the promoter element of the lac operon sterically blocking the RNA polymerase from the promoter so transcription can not be initiated.
c. In response to the cell producing more beta-galactosidase, lactose levels will decrease and glucose levels will increase.
d. The lactose molecule must be present and bind to RNA polymerase in order for transcription to be initiated.

Answer 1

Option (C).

Step-by-step explanation:

The lac operon may be defined as the group of genes that are involved in the lactose metabolism of the E.coli bacteria. François Jacob and Jacques Monod was the first scientists to explain the mechanism of Lac operon.

The production of large amount of beta-galactosidase by the cells, the lactose level will decrease. This causes the elevation of the glucose level in the E.coli bacteria.

Thus, the correct answer is option (c).