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

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

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Transcription and Regulation
What is a promoter?

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

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