Which is the only prokaryotic DNA polymerase with 5'-3' exonuclease activity?: (A) DNA Polymerase I, (B) DNA Polymerase II, (C) DNA Polymerase III, (D) DNA Polymerase IV
Answer is A. DNA polymerase I 1st DNA polymerase discovered Only polymerase with 5'-3' exonuclease activity. DNA polymerase I 5' - 3' polymerase Polymerisation 3' - 5' exonuclease Proofreading 5' - 3' exonuclease Removal of RNA primer, DNA repair, nick-translation