Transcription and Regulation
The closed complex at bacterial promoters is

not affected by activator proteins
bound more tightly when repressors are present
in equilibrium with free RNA polymerase and the promoter
not affected by promoter mutations

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Transcription and Regulation
The function of the sigma factor of RNA polymerase is to

assure that translation ends at the proper point
assure that transcription ends at the proper point
assure that translation begins at the proper point
assure that transcription begins at the proper point

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