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What is the difference in the role of an operator and the role of a promoter?

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craigc456
A promoter is found upstream of all genes and is the site where RNA polymerase binds for transcription to begin. An operator is again a nucleotide sequence but is found only in operons and regulons. The operator region, depending on a cell's regulatory mechanisms, is where an activator and repressor bind to either turn on or off transcription                              .....
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