The lactose operon is likely to be transcribed when A) there is ...

[aero]

The lactose operon is likely to be transcribed when
A) there is more glucose in the cell than lactose.
B) the cyclic AMP levels are low.
C) there is glucose but no lactose in the cell.
D) the cyclic AMP and lactose levels are both high within the cell.
E) the cAMP level is high and the lactose level is low.

[Hawke]

I'd go with D. It makes sense.

[aero]

Thanks Hawke