Answer: lac operon is enhanced when CAP-cAMP complex interacts with rna polymerase.
Explanation:
The operon is defined as a set of structural genes organized in sequence and under the control of a single promoter. RNA polymerase transcribes, from the common promoter, all the structural genes into a single polycistronic RNA molecule, which is translated into the proteins encoded by the genes.
The CAP-cAMP Complex acts positively by providing the basic conditions for transcription. The complex binds to the lac promoter and doubles the DNA of this region, which allows it to be recognized by the RNA polymerase. In the absence of cAMP or CAP protein, the process of transcription does not occur because the RNA polymerase does not recognize the Lac promoter. When the CAP-cAMP complex is present, the promoter is recognized by the RNA polymerase, which binds to it. The CAP protein is, therefore, an activator and the cAMP an effector.
