The Ability of Glucose to Repress the Lac Operon Depends

Question

The ability of glucose to repress the lac operon depends on which effector molecules?
A)allolactose
B)cAMP
C)tryptophan
D)ADP
E)starch

Accepted Answer

Glucose represses the lac operon by affecting the levels of cyclic AMP (cAMP) in the cell. When glucose levels are high, cAMP levels decrease, which in turn reduces the activity of cAMP receptor protein (CRP), a necessary activator for the transcription of the lac operon.