If the repressor protein does not bind to the operator, then RNA polymerase will be able to transcribe the genes of the lac operon, which includes genes that enable the breakdown of lactose. In the presence of lactose, the lactose molecule binds to the repressor protein, causing a conformational change that prevents it from binding to the operator, thereby allowing transcription of the lac operon genes.

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Question 33

Multiple Choice

A) the repressor will bind the operator,thus allowing transcription of the lac operon genes.
B) the repressor will NOT bind the operator,thus preventing transcription of the lac operon genes.
C) the repressor will NOT bind the operator,thus allowing transcription of the lac operon genes.
D) the repressor will bind the operator,thus preventing transcription of the lac operon genes.
E) coli bacterium are grown in the presence of lactose

Correct Answer: