DNA Replication

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DNA Replication
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Base pairing
G A C T A G A T
C T G A T C T A
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What makes a nucleotide?

• List the 3 parts of a nucleotide

Phosphate Sugar Nitrogen Base
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More base pairing

• T T A G C T C T

A A T C G A G A
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5 Steps to DNA Replication

• Step 1
• Enzyme initiates (starts) replication and
  untwists the helix

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• Step 2
• DNA unzips

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Step 3Free Nucleotides attach(the nucleotides
bind tothe unzipped DNA strands)
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A T G C A G A T C G C G A T

• Step 4
• Enzymes check for errors

A G
T
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• Step 5
• Enzymes twist the
• new strands (creating the double helix)
• Results
• 2 identical copies

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5 steps of DNA Replication

• Enzyme initiates replication and untwists the
  helix
• DNA unzips
• Free nucleotides attach
• Enzymes check for errors
• Enzymes twist DNA creating 2 double helix DNA
  stands

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Semi-Conservative Replication
Original DNA
Original DNA
New DNA