1) Usually, the promoters of positively-controlled operons require activator pro

Question

1) Usually, the promoters of positively-controlled operons require activator proteins because A) RNA polymerase easily recognizes the consensus sequence B) they are required to counteract the effect of repressor proteins C) their promoters have nucleotide sequences that are not close matches to the consensus sequence at the - 35 region and Pribnow box D) they are needed to bind to an allosteric site of RNA polymerase to increase the polymerase?s enzymatic activity E) they are needed to melt and unwind the DNA double helix at the promoter

Explanation / Answer

A

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