The lac repressor can function as an inhibitor of transcription of the lactose operon because of its ability to

Question

Quizplus · Accepted Answer

The lac repressor is able to bind with high affinity to the operator region in the DNA sequence of the lactose operon, physically blocking RNA polymerase from accessing the promoter region and inhibiting transcription. This regulatory mechanism allows the lac repressor to prevent the unnecessary transcription of genes involved in lactose metabolism when lactose is absent or scarce in the environment.

The Lac Repressor Can Function as an Inhibitor of Transcription