Transcription and Regulation
The closed complex at bacterial promoters is

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

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Transcription and Regulation
What is a promoter?

None of these
A specific sequence of DNA to which a catabolic repressor binds
A specific sequence of DNA to which RNA polymerase binds
A specific DNA sequence to which a restriction endonuclease binds

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