Prokaryotic Polymerases

   DNA polymerase I

Erases primer and fills in gaps on lagging strand

   DNA polymerase II (error-prone polymerase)

DNA repair

   DNA polymerase III

Primary enzyme of DNA synthesis

Eukaryotic Polymerases

   DNA polymerase α

      Primase subunit

      DNA polymerase unit

Initiator polymerase

   Synthesizes the RNA primer

   Adds stretch of about 20 nucleotides to the primer

   DNA polymerase β (error-prone polymerase)

DNA repair

   DNA polymerase δ

Primary enzyme of DNA synthesis