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What is the role of the sigma factor in the process of RNA synthesis initiation by RNA polymerase?A. The sigma factor is responsible for terminating RNA synthesis by recognizing the terminator sequence.B. The sigma factor recognizes the promoter of a gene and helps RNA polymerase bind to the DNA to initiate transcription.C. The sigma factor synthesizes RNA by adding nucleotides to the growing RNA strand.D. The sigma factor re-associates with RNA polymerase after the termination of transcription to begin a new round of RNA synthesis.

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