How Do Negative Regulators Such as the Lac Repressor Prevent

question 5

Multiple Choice

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

• A) by blocking passage of the polymerase through the operator
• 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,thus preventing its binding
• E) by degrading metabolic activators

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