The CAP molecule can attach to the CAP binding site only when the
A)CAP molecule is bound to lactose.
B)CAP molecule is bound to tryptophan.
C)CAP molecule is bound to ATP.
D)CAP molecule is bound to cAMP.
E)CAP molecule is activated by homeodomain DNA binding motif.

Question

Quizplus · Accepted Answer

The CAP molecule can only attach to the CAP binding site when it is bound to cAMP. This binding of cAMP to CAP causes a conformational change in the protein, allowing it to bind to the DNA region near the promoter site and activate transcription.

The CAP Molecule Can Attach to the CAP Binding Site