Transcription and Regulation
Transcription by E. coli polymerase occurs in

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

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

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

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