How Does Binding of the Lac Repressor to the Lac

question 16

Multiple Choice

How does binding of the lac repressor to the lac operator block transcription initiation?

• A)lac repressor binding blocks RNA polymerase from interacting with DNA at the start site.
• B)lac repressor binding induces a DNase that cleaves the DNA at the transcription start site.
• C)lac repressor binding causes a conformational change in RNA polymerase.
• D)lac repressor binding induces a protease that degrades the sigma subunit of RNA polymerase.

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