Transcription and Regulation
Transcription by E. coli polymerase occurs in

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

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

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

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Transcription and Regulation
What is a promoter?

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

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