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Which DNA polymerase removes RNA primers in DNA synthesis?

  • A.Polymerase I
  • B.Polymerase II
  • C.Polymerase III
  • D.none of these

Answer: A

Correct answer: Polymerase I

Pol I alone has a 5’→3’ exonuclease, and that is what lets it chew away the RNA primer ahead of itself while its polymerase activity fills the gap behind - the process called nick translation. Pol III, which does the bulk of synthesis, has no such activity.

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