Replication of DNA

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  • Created by: 08rmorris
  • Created on: 31-03-15 17:21
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  • Replication of DNA
    • 1.
      • Replication starts at a specific sequence on the DNA molecule called the replication origin
    • 2.
      • The enzyme DNA helicase unwinds and separates the two strands of DNA, breaking the H bonds between base pairs
    • 3.
      • The new DNA is built up from the 4 nucleotides (A,C,G and T) that are present in the nucleoplasm
    • 4.
      • The nucleotides attach themselves to the bases on the old strands by complementary base pairing
    • 5.
      • The enzyme DNA polymerase joins the new nucleotides to each other by strong covalent phosphodiester bonds, forming the sugar-phosphate backbone
    • 6.
      • Another enzyme winds the new strands up to from double helices
    • 7.
      • The 2 new DNA molecules are identical to the old molecule. Each new DNA molecule contains one 'new' strand and one 'old' strand

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