The prokaryotic version requires a sigma factor for activation and rho for release, while the eukaryotic one looks for certain DNA sequences called promoters to begin its work.  
The amanitoxin in poisonous mushrooms affects humans by inhibiting this enzyme, of which there are three eukaryotic varieties but only one prokaryotic.  The prokaryotic version requires a sigma factor for activation and rho for release, while the eukaryotic one looks for certain DNA sequences called promoters to begin its work.  FTP, name this enzyme, responsible for the transcription of mRNA.
The amanitoxin in poisonous mushrooms affects humans by inhibiting this enzyme, of which there are three eukaryotic varieties but only one prokaryotic.  
RNA polymerase