dna replication dna is replicated before cell division, when a cell divided into two cells

Download DNA Replication DNA is replicated before cell division, when a cell divided into two cells

Post on 20-Dec-2015

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  • Slide 1
  • DNA Replication DNA is replicated before cell division, when a cell divided into two cells
  • Slide 2
  • Enzymes help DNA replication occur. Helicase- unzips the two stands of DNA breaking the hydrogen bonds that hold them together. DNA Polymerase adds complementary nucleotides A-T G-C DNA Ligase connects fragments of DNA on the lagging stand to make a continuous molecules.
  • Slide 3
  • Replication fork DNA polymerase New strand Original strand DNA polymerase Nitrogenous bases Replication fork Original strand New strand
  • Slide 4
  • Slide 5
  • Proofreading After the two daughter strands are complete, other enzymes proof read the DNA checking the original or parent strand. DNA Polymerase makes about 1 mistakes in ever 500 base pairs, but after proofreading as few as 1 mistake in a billion base pairs can be found Helping to prevent mutation from occurring!!

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