How Does the Binding of the λ Phage CI

question 20

Multiple Choice

How does the binding of the λ phage cI repressor to O_R1 and O_R2 block transcription from P_R?

• A) It prevents the RNA polymerase from transcribing down the gene.
• B) It blocks binding of the RNA polymerase to the -10 and -35 sites on the promoter.
• C) It terminates transcription at an earlier terminator.
• D) It leads to the degradation of the RNA produced from P_R.
• E) It activates a promoter that produces an antisense transcript.

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