At What Point Does the Sigma ( σ ) Subunit

question 15

Multiple Choice

At what point does the sigma ( σ ) subunit of RNA polymerase released from the core enzyme?

• A) Prior to the incorporation of any nucleotides into an RNA strand.
• B) After transcription begins and about 10 nucleotides have been added to the RNA chain.
• C) Just prior to chain termination.
• D) Never; it is an intrinsic part of the core enzyme.
• E) After RNA polymerase discovers an inverted repeat

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