What does DNA plymerase do during replication?

Answer 1

At the start of DNA replication, an enzyme called topoisomerase untwists the double helix nature of DNA while another enzyme called helicase literally breaks the two halves of the DNA apart. Once the DNA has been split, RNA primase attaches an RNA primer to one of the exposed nucleotides. It is then the job of the DNA polyemrase to go down the DNA strand from the 3' to 5' direction starting at the primer, adding the complementary base to each nucleotide found along the strand. This creation of new nucleotides continues down the DNA until the polymerase reaches another polymerase or the end of an already reconstructed chain. In the mean time, another polymerase has replaced the RNA primer with a corresponding DNA nucleotide. Everything is then finished up as ligase enzymes bind all of the various fragments of DNA together.