Why Is Binding of The $\lambda$ Phage CI Repressor to O_R1 and O_R2 Necessary for Transcription

question 22

Multiple Choice

Why is binding of the $\lambda$ phage cI repressor to O_R1 and O_R2 necessary for transcription from P_RM?

• A)It facilitates binding of the RNA polymerase to P_RM.
• B)It blocks transcription from P_L which competes for the RNA polymerase.
• C)It prevents transcription of an antisense RNA.
• D)It stabilizes the transcript from P_RM.
• E)It allows read through a transcriptional terminator.

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