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

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

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Transcription and Regulation
What is a promoter?

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

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Transcription and Regulation
The transcriptional regulatory proteins in eukaryotes which induce transcription usually have

at least two distinct domains of protein structure and a DNA binding domain
at least two distinct domains of protein structure, a DNA binding domain and an activation domain
none of these
at least one distinct domains of protein structure, a DNA binding domain and an activation domain

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