Transcription and Regulation
In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is

none of these
RNA polymerase II
RNA polymerase I
RNA polymerase III

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

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

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