Final answer:
The statement is true; cAMP binds to CRP, also known as CAP, enhancing its binding to the lac operon promoter, thus promoting transcription in low glucose conditions.
Step-by-step explanation:
The statement that cAMP binds to the CRP, increasing its affinity for a DNA site near the lac operon promoter, is true. The cAMP receptor protein (CRP), also known as the catabolite activator protein (CAP), is activated by binding with cAMP in the presence of low glucose levels. This CAMP-CRP complex then binds to the promoter region upstream of the RNA polymerase binding site, thereby increasing RNA polymerase's ability to bind to the promoter and initiate transcription of the structural genes within the lac operon. This is an essential step for the cell to efficiently utilize lactose as an energy source when glucose is scarce.
cAMP, or cyclic adenosine monophosphate, binds to the CRP, or catabolite activator protein (also known as the CAMP receptor protein), increasing its affinity for a DNA site near the lac operon promoter. This binding of cAMP-CRP complex to the promoter region increases the binding ability of RNA polymerase, which allows for the initiation of transcription of the structural genes in the lac operon.