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NOTES: DNA Replication

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Friday 3-12-2010 NOTES: DNA Replication (1) Why Replicate DNA? Happens during S-Phase of Cell Cycle Need a second copy of DNA for daughter cells (of Mitosis / Meiosis). – PowerPoint PPT presentation

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Title: NOTES: DNA Replication


1
NOTES DNA Replication
  • Friday3-12-2010

2
(1) Why Replicate DNA?
  • Happens during S-Phase of Cell Cycle
  • Need a second copy of DNA for daughter cells (of
    Mitosis / Meiosis).

3
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4
(2) Replication Steps
  • Unwind DNA.
  • Unzip / Separate the 2 strands.
  • Match up complimentary bases/nucleotides.
  • Bond the new strand to the old strand.
  • Enzymes do all of the work!
  • RESULT
  • 2 DNA Molecules
  • Each Molecule 1 template strand, 1 daughter
    strand

5
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6
  • http//www.youtube.com/watch?vhfZ8o9D1tus

7
(3) Complimentary Bases
  • REMEMBER Nitrogenous Bases are connected to
    nucleotides.
  • Always Match Up
  • A with T
  • T with A
  • G with C
  • C with G

8
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9
(4) Semi-Conservative
  • Discovered by Messelson Stahl.
  • Semi Half
  • Conservative Saved
  • Each new DNA molecule maintains ½ the original
    molecule (template), and has ½ a new strand!

10
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11
(5) 3 ? 5
  • 3 Three Prime
  • 5 Five Prime
  • New, complimentary bases are laid down along the
    parent strand in the 3 to 5 direction.
  • The enzymes which unwind DNA and make the new
    strand only move in this direction!
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