What role do cAMP and CAP play in transcription of lac operon genes? A) CAP bind

Question

What role do cAMP and CAP play in transcription of lac operon genes?

A) CAP binds the CAP binding site of the lac promoter to carry out negative control of operon gene transcription, whereas cAMP blocks the CAP binding site and thereby allows fine-tuning of the system. B) CAP and cAMP form a complex that binds the CAP binding site of the lac promoter to carry out negative control of operon gene transcription. C) CAP binds the CAP binding site of the lac promoter to carry out positive control of operon gene transcription, whereas cAMP blocks the CAP binding site and thereby allows fine-tuning of the system. D) CAP and cAMP form a complex that binds the CAP binding site of the lac promoter to carry out positive control of operon gene transcription.

Explanation / Answer

The correct answer is option D that is CAP and cAMP form a complex that binds the CAP binding site of the lac promoter to carry out positive control of operon gene transcription. cAMP is a hunger signal for cell when glucose is absent and it is formed from ATP in presence of Adenyl cyclase and binds to CAP and changes its shape and making it bind to dna and allow transcription

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