Which of the following proteins is found only in the RNA polymerase holoenzyme?

Name: Which of the following proteins is found only in the RNA polymerase holoenzyme?
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Question

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Sigma protein is specific to RNA polymerase holoenzyme and is responsible for recognizing the promoter region of DNA and initiating transcription. Alpha, beta, epsilon, and rho proteins are also found in RNA polymerase holoenzyme but are also present in other forms of RNA polymerase.

Which of the Following Proteins Is Found Only in the RNA