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

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

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Transcription and Regulation
Most transcripts of protein coding genes are cleaved

at the 3' end just before a poly adenylation signal
at the 5' end immediately before a poly adenylation signal
at the 3' end just after a poly adenylation signal
at the 5' end immediately after a poly adenylation signal

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