How does active CAP induce expression of the genes of the lactose operon?

Answer 1

By opening up the Double Helix...

CAP: Catabolite Activator Protein....

Activated by cAMP ( cyclic AMP, Adenosine Mono Phosphate) it binds to the promotor region and opens up the Double Helix. It basically deforms the helix (it bends it).

This enables RNA Polymerase to begin transcription. (for the genes involved in Lactose catabolism).

Nice Picture:

Pink = DNA of course, Blue = CAP....

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Answer 2

Luna Cruz

Active CAP enhances the transcription of the lactose operon genes by binding to the CAP site, facilitating RNA polymerase binding to the promoter, and promoting gene expression in the presence of cAMP.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.