| DNA Polymerase | 5′→3′ Polymerization | 3′→5′ Exonuclease | 5′→3′ Exonuclease | Function |
|---|---|---|---|---|
| I | Yes | Yes | Yes | Removes and replaces primers |
| II | Yes | Yes | No | DNA repair; restarts replication after damaged DNA halts synthesis |
| III | Yes | Yes | No | Elongates DNA |
| IV | Yes | No | No | DNA repair |
| V | Yes | No | No | DNA repair; translesion DNA synthesis |