Transcription and Regulation
The closed complex at bacterial promoters is

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

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Transcription and Regulation
What is a promoter?

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

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