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 glucose in the growth media
Presence of IPTG (isopropyl thiogalactoside) in the growth media
Presence of lactose in the growth media

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

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Transcription and Regulation
The function of the sigma factor of RNA polymerase is to

assure that transcription ends at the proper point
assure that translation begins at the proper point
assure that transcription begins at the proper point
assure that translation ends at the proper point

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