The lac operon is a genetic switch found in bacteria that turns on genes involve

Question

The lac operon is a genetic switch found in bacteria that turns on genes involved in lactose transport into the cell. It involves both positive and negative regulation. What is the mechanism by which low glucose levels turn on gene expression?

A. A repressor falls off of the promoter in low glucose

B. CAP knocks a repressor off of its DNA binding site

C. RNA polymerase is phosphorylated, activating it and leading to expression

D. CAP binds to DNA and acts as a transcriptional activator

E. Trp binds its ligand and falls off of DNA

NEED EXPLANATION ALSO NOT JUST ANSWER!

Explanation / Answer

D- cap bind to dna and act as transcriptional activator.

Note- when the concentration of glucose decreases the atp is converted to cAMP which activated CAP . This complex of CAP and cAMP bind to the dna acnd act as activator to it allowing rna polymerase binding to dna for transcription of gene

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