Essential Biochemistry - Regulation Of Gene Expression And Mutation (Section 1 - No. 50)
What is the primary function of the CAP (Catabolite Activator Protein) in the lac operon?
To bind to the operator
To enhance the binding of RNA polymerase to the promoter in the absence of glucose and the presence of lactose.
To inhibit the expression of structural genes.
To break down lactose.
Explanation
CAP stimulates transcription when glucose is absent and lactose is present.
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