Biology / Bio 1259 · Atom · ~20 seconds
Prokaryotic RNA Polymerase and the Promoter
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Prokaryotic RNA polymerase binds a promoter, a DNA sequence upstream of a gene, to begin transcribing that gene into RNA.
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A single RNA polymerase transcribes every gene in a bacterium, guided to each gene's promoter in turn.
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A promoter's sequence determines how often its gene is transcribed — RNA polymerase itself does not vary between different genes.