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. 3. There is a 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, there is a conformational change in the repressor (3), which then detaches from the operator region of the lac operon. This allows RNA polymerase to bind to the promoter and transcribe the lac operon (1), leading to an increase in the amount of beta-galactosidase in the cell (4) as it is one of the enzymes encoded by the lac operon. The binding of the catabolite activator protein (CAP) to DNA is related to the presence of cyclic AMP (cAMP) and is a separate regulatory mechanism that responds to glucose levels, not directly to the binding of lactose to the lac repressor.

Which of the Following Occur as a Result of the Inducer