In the lac operon of E. coli, what happens when lactose is present but glucose levels are low?

• A. The lac repressor binds to the operator, preventing transcription.
• B. cAMP levels decrease, leading to reduced binding of CAP-cAMP to the promoter.
• C. cAMP levels increase, enhancing the binding of CAP-cAMP to the promoter and facilitating transcription.
• D. The lac operon is permanently deactivated, and no transcription occurs.

Answer: (C)