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The promoters of positively controlled operons require activator proteins because1. A) RNA polymerase easily recognizes the consensus sequence.2. B) they are required to inactivate the repressor proteins.3. C) the promoters bind RNA polymerase weakly and utilize activator proteins tohelp RNA polymerase recognize the promoter.4. D) they are needed to bind to the allosteric site of RNA polymerase.

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