Transcription and Regulation
Transcription by E. coli polymerase occurs in

three phases known as initiation, elongation and termination
two phases known as initiation and termination
None of these
four phases known as initiation, propagation, elongation and termination

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

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Transcription and Regulation
Multiple copies of 5S genes, located at a chromosomal site distinct from the other rRNA genes

are transcribed by DNA polymerase I
are transcribed by rRNA polymerase I and the 5S rRNA
are transcribed by rRNA polymerase III and the 5S rRNA
are transcribed by rRNA polymerase II

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