DNA Replication Part 1

DNA Replication Part 1

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  • Yeah! DNA Replication occurs in the nucleus. DNA replication needs to occur because existing cells divide to produce new cells. It occurs during the nucleus.
  • OMG! It's cold lets go inside and talk about the Cell Cycle? Do you know where DNA Replication occurs? Why does it need to occur? When does it occur?
  • An enzyme called DNA helicase, is responsible for unzipping the nucleotide chains of the double helix.
  • So, what the heck is helicase?
  • The enzyme RNA primase adds a short segment, called an RNA primer, on each DNA strand.
  • So, what is RNA Primase?
  • An enzyme called, DNA polymerase continues to add DNA nucleotides to the chain by adding to the 3′ end of the new DNA strand.
  • I'm still confused about DNA Polymerase
  • DNA ligase links the two sections. When DNA replication is complete, there are 2 identical copies of the parent DNA.
  • Wait, then what is RNA Ligase?
  • The lagging chain attaches short sections of nucleotides called Okazaki fragments.
  • What are Okazaki fragments?
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