KCET 2019 Biology Solved Paper

Transcription of mRNA begins at the initiation site.Two promoter consensus sequences are at the –10 and –35 regions upstream of the initiation site. The σ subunit of RNA polymerase recognizes and binds the –35 region. Five subunits (α, α, β, β′, and σ) make up the complete RNA polymerase holoenzyme.