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 III
RNA polymerase I

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Transcription and Regulation
Multiple copies of 5S genes, located at a chromosomal site distinct from the other rRNA genes

are transcribed by DNA polymerase I
are transcribed by rRNA polymerase I and the 5S rRNA
are transcribed by rRNA polymerase II
are transcribed by rRNA polymerase III and the 5S rRNA

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

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

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