Transcription and Regulation
The closed complex at bacterial promoters is

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

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Transcription and Regulation
The transcriptional regulatory proteins in eukaryotes which induce transcription usually have

at least two distinct domains of protein structure and a DNA binding domain
at least one distinct domains of protein structure, a DNA binding domain and an activation domain
none of these
at least two distinct domains of protein structure, a DNA binding domain and an activation domain

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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?

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

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Transcription and Regulation
The major function of RNA polymerase's sigma factor is

recognition of the transcriptional stop sequence
recognition of the translational start sequence
recognition of the translational stop sequence
recognition of the transcriptional start sequence

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