In addition to polymerase activity, this DNA polymerase exhibits 5'-3' exonuclease activity. May be required for DNA replication and accumulation in mitochondria (By similarity). a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) = diphosphate + DNA(n+1) Not inhibited by aphidicolin. Belongs to the DNA polymerase type-A family.