In bacteria,a particular gene codes for a protein that helps the bacteria break down and use lactose as a food source.If no lactose is present,the

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Quizplus · Accepted Answer

The presence or absence of lactose affects the regulatory region of the gene, specifically the promoter. In the absence of lactose, the Lac repressor protein binds to the operator region, blocking RNA polymerase from binding to the promoter and transcribing the gene. Therefore, the correct answer is C.

In Bacteria,a Particular Gene Codes for a Protein That Helps