<prompt> The sigma σ subunit of prokaryotic RNA polymeraseBinds the antibiotic rifampicinIs inhibited by α-amanitinSpecifically recognizes the promoter siteIs part of the core enzyme  <response>: Sigma σ factor recognizes promotor sequences on the DNA template. Different factors recognize a different group of genes.α-amanitin inhibit RNA polymerase II of eukaryotes.Rifampicin inhibits β-subunit of RNA polymerase.Sigma unit is not a part of core enzyme; it is a part of holoenzyme.RNA polymerase holoenzyme core enzyme 2α, β, β sigma σ subunit 