A) lac repfessor only
B) lac represser and CAP-cGM P complex
C) lac,repressor and CAP-cAMP complex
D) CAP-cAMP and CAP-cGMP complex
Correct Answer: C
Solution :
The lac operon is regulated by lac represser and CAP-cAMP complex. The inducer - repressor control of the lac operon is an example of negative control of lac-operon, in which expression is normally blocked. In contrast, the CAP-cAMP system is an example of positive control because expression of the lac operon requires the presence of an activating single. In this case, the interaction of the CAP-cAMP complex with the CAP region takes place.
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