Transcription and Regulation
The closed complex at bacterial promoters is

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

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Transcription and Regulation
What is a promoter?

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

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