Question

The lactose operon is likely to be transcribed when.

Answer 1

Answer:

the lac operon can only be transcribed at high levels when glucose is absent.

Explanation:

This strategy ensures that bacteria only turn on the lac operon and start using lactose after they have used up all of the preferred energy source (glucose).

Answer 2

High levels of cAMP are required for the genes of the lactose operon to be transcribed.

How are the genes of the lactose operon transcribed?

Cyclic AMP (cAMP) is required for the transcription of all operons that are inhibited by glucose catabolism.

The catabolite-activating protein (CAP) is a dimer that, when bound to cAMP, activates and stimulates the transcription of the lactose operon genes, so that the CAP-cAMP activating protein is necessary for the binding of RNA-polymerase to the promoter of the lactose operon genes.

Therefore, we can conclude that high levels of cAMP are needed for the genes of the lactose operon to be transcribed.

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