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

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

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Transcription and Regulation
Most transcripts of protein coding genes are cleaved

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

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