a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) = diphosphate + DNA(n+1) This DNA polymerase requires a protein as a primer. The presence of the two linear plasmids, termed pGKl-1 and pGKl-2, in strains of Kluyveromyces lactis confers the killer phenotype, i.e. production of toxin and resistance to it, to the host cell. Belongs to the DNA polymerase type-B family.