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  • Semi Conservative DNA replication!
  • Please be respectful and watch this video we have for you today!
  • So everyone, today this is what we are talking about!
  • You can take notes too!
  • Hello! My name is Destiney, and today i will be talking to you about DNA semi conservative replication.
  • First, an enzyme, helicase, breaks apart hydrogen bonds between bases. This "unzips" the DNA.
  • DNA enzyme (helicase) is moving this direction.
  • 3' 5'
  • Also, this creates a replication fork!
  • 5'
  • 3'
  • This creates a lagging strand and a leading strand
  • Next, an enzyme, polymearse, pairs complementary nucleotides to exposed bases on the parent strands
  • 3' 5'
  • new base complementary bases and original bases
  • = enzyme
  • 5'
  • 3'
  • leading strand lagging strand -made up of okazaki fragments.
  • Last step! An enzyme, ligase, forms bonds between the sections of newly constructed DNA
  • 3' 5'
  • = enzyme
  • new base complementary bases and original bases with bonds.
  • 5'
  • 3'
  • leading strand lagging strand -made up of okazaki fragments.
  • lets go over what we learned.
  • Step 1- "unzipping" of DNA! ~Enzyme= Helicase Step 2- pairing of complementary bases ~Enzyme= Polymerase Step 3- New complementery bases ~Enzyme= ligase
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