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Which of these is not a part of RNA polymerase elongation machinery?

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Which of these is not a part of RNA polymerase elongation machinery?

(a) NTP entry channel

(b) RNA entry channel

(c) DNA entry channel

(d) Clamp

This question was addressed to me in a national level competition.

My doubt is from Transcription in Prokaryotes : Elongation in division Gene Expression : Transcription Prokaryotes of Cytogenetics

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Right answer is (b) RNA entry channel

Explanation: As the RNA is synthesized there is an RNA exit channel but there is no need of RNA entry channel. Clamp and flap on the other hand help to stabilize the polymerase structure.

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