First slide

Regulation of Gene Expression

Question

When the repressor binds the operator

Easy

A

It helps RNA polymerase to initiate transcription.
B

It helps to increase the rate of transcription of the structural genes
C

It prevents RNA polymerase from initiating transcription of structural genes.
D

It makes the promoter inactive permanently

Solution

When the repressor binds the operator, it prevents RNA polymerase from initiating transcription. The capability of the repressor to bind the operator and inhibit transcription depends on the conformation of the repressor, which is regulated allosterically by a key compound in the metabolic pathway, such as lactose or tryptophan.

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