much more complex less well understood 3 classes of RNA polymerases RNA polymerase I -> genes encoding ribosomal RNAs RNA polymerase II -> genes encoding messenger RNAs RNA polymerase III -> genes encoding transfer RNAs
The transcription elements of a eucaryotic structural gene extend over a large region of DNA
core or basal promoter elements promoter proximal elements distal enhancer element
Model for transcriptional activation -
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