Elongation

After initiation, RNA polymerase moves downstream along the template, progressively unwinding the DNA at the leading (downstream) edge of the transcription bubble, joining nucleotides to the RNA molecule according to the sequence on the template, and rewinding the DNA at the trailing (upstream) edge of the bubble. In bacterial

Conclusion: RNA transcription is initiated when core RNA polymerase binds to the promoter with the help of sigma.
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