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Which enzyme makes the transcription, an essentially irreversible process?

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Which enzyme makes the transcription, an essentially irreversible process?

(a) pyrophosphatase

(b) amylase

(c) glucamylase

(d) topoisomerase

I have been asked this question during an internship interview.

I'd like to ask this question from Gene Expression in portion Gene Expression of Cell Biology

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The correct answer is (a) pyrophosphatase

The best explanation: Reactions leading to the synthesis of nucleic acids must occur under irreversible conditions. These conditions are met during transcription with the aid of enzyme called pyrophosphatase.

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