When glucose is present, . Multiple Choice cyclic AMP is high, CAP does not bind to the activator binding site, and transcription of lactose operon is turned on cyclic AMP is low, CAP does not bind to the activator binding site, and transcription of the lactose operon is turned off cyclic AMP is low, CAP binds to the site activator binding site, and transcription of lactose operon is turned on cyclic AMP is high, the catabolite activator protein (CAP) binds to the activator binding site, and transcription of lactose operon is turned on