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?

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

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Transcription and Regulation
Which of the following conditions would cause the release of the lac repressor protein from the lac operator site on DNA?

Presence of glucose in the growth media
Both (b) and (c)
Presence of IPTG (isopropyl thiogalactoside) in the growth media
Presence of lactose in the growth media

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