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DNA Replication McGraw Hill DNA Replication Movies

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DNA Replication McGraw Hill DNA Replication Movies the two strands of DNA are separated and then used as templates from which new strands are constructed does this ... – PowerPoint PPT presentation

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Title: DNA Replication McGraw Hill DNA Replication Movies


1
DNA Replication
2
McGraw Hill DNA Replication Movies
  • the two strands of DNA are separated and then
    used as templates from which new strands are
    constructed
  • does this before the cell divides (mitosis)
  • DNA is anti-parallel (the two strands run in
    opposite directions)

3
  • DNA is semi-conservativeeach molecule formed by
    replication consists of one newly formed strand
    (daughter strand), and one old strand (parental)

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  • the enzyme helicase uncoils the double helix
    within the DNA molecule at sites called origins
    of replication/replication fork and splits it
    into two template strands
  • DNA can only be replicated in one direction
  • therefore, assembly is continuous on one strand
    (called the leading daughter strand) and
    discontinuous on the other (called the lagging
    daughter strand)

6
  • an enzyme acts as a primer and attaches short
    segments of RNA to both strands of DNA
  • another enzyme starts replication next to this
    new RNA primer in only one direction.
  • it therefore moves away from the replication fork
    in the lagging strand and towards it in the
    leading strand
  • copied at about 50 base pairs per second in
    animals in multiple areas on the DNA strand

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  • on the lagging strand
  • short lengths of DNA (called Okazaki fragments)
    are formed between RNA primers.
  • an enzyme removes the RNA primer added earlier
    and replaces it with DNA
  • another enzyme bonds the ends of adjacent DNA
    fragments together

http//www.youtube.com/watch?v4jtmOZaIvS0
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http//www.johnkyrk.com/DNAreplication.html
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