Which of the following occur as a result of the inducer (lactose or a derivative of lactose) binding to the lac repressor protein? 1. RNA polymerase transcribes the lac operon. 2. Catabolite activator protein binds to a specific site on the DNA. There is conformational change in the repressor. 4. The amount of beta-galactosidase increases in the cell.

Question

Quizplus · Accepted Answer

When lactose or a derivative of lactose binds to the lac repressor protein, it causes a conformational change in the repressor, which then releases its hold on the operator region of the lac operon. This allows RNA polymerase to transcribe the genes within the operon, including the gene for beta-galactosidase, resulting in an increase in the amount of beta-galactosidase in the cell. However, there is no direct effect on catabolite activator protein binding to the DNA, so option 2 is incorrect.

Which of the Following Occur as a Result of the Inducer