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
RNA polymerase I
none of these

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Transcription and Regulation
Most transcripts of protein coding genes are cleaved

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

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