How Do Negative Regulators Such as the Lac Repressor Prevent

question 22

Multiple Choice

How do negative regulators such as the Lac repressor prevent RNA polymerase from initiating transcription?

• A)by blocking the ribosome binding site
• B)by forming a loop in the operator that restricts the passage of the polymerase
• C)by physically blocking the DNA binding site of RNA polymerase
• D)by binding to the polymerase to inhibit its catalytic activity

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