<prompt> The sigma s subunit of prokaryotic RNA polymeraseBinds the antibiotic rifampicinIs inhibited by a-amanitinSpecifically recognizes the promoter siteIs pa of the core enzyme  <response>: prokaryotic RNA polymers contain 2 alpha subunit, 2 beta subunit, 1 omega subunit, 1 sigma subunit and 2 zinc molecules Beta subunit fixes at the initiation siteThe sigma factor recognizes the promoter site and the affinity of the holoenzyme to the promoter siteRef: DM Vasudevan, 7th edition, page no: 589 