<prompt> The catabolite repression is mediated by a catabolite gene activator protein CAP in conjunction with:AMPGMPc-AMPC-GMP  <response>: Ans. C. c-AMPAttachment of RNA polymerase to the promoter site requires the presence of a CAP bound to C-AMP. The presence of glucose lowers the intracellular concentration of c-AMP by inactivating the enzyme adenylate cyclase responsible for the synthesis of c-AMP. Therefore, the binding of RNA polymerase to DNA due to the absence of CAP-c-AMP and the transcription are negligible in the presence of glucose. 