When lactose is absent, transcription does not occur because the binds to the and prevents from binding to the promoter.

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Prepare for the DNA Biology Test. Study with flashcards and multiple choice questions, each with hints and explanations to deepen understanding. Excel in your examination!

Multiple Choice

When lactose is absent, transcription does not occur because the binds to the and prevents from binding to the promoter.

The situation is a classic example of negative regulation of transcription. In the lac operon, when lactose is absent, the Lac repressor is active and binds to the operator region on the DNA. This binding physically blocks RNA polymerase from accessing the promoter, so transcription cannot start. The best way to describe this is that transcription is prevented because the repressor binds to the operator and prevents RNA polymerase from binding to the promoter. This captures why transcription stops without lactose, and why the highlighted combination matches the mechanism.

When lactose is absent, transcription does not occur because the ________ binds to the ________ and prevents ________ from binding to the promoter.

Prepare for the DNA Biology Test. Study with flashcards and multiple choice questions, each with hints and explanations to deepen understanding. Excel in your examination!

When lactose is absent, transcription does not occur because the ________ binds to the ________ and prevents ________ from binding to the promoter.

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When lactose is absent, transcription does not occur because the binds to the and prevents from binding to the promoter.

When lactose is absent, transcription does not occur because the binds to the and prevents from binding to the promoter.