1. DNA Replication

2. Base pairing
G A C T A G A T
C T G A T C T A

3. What makes a nucleotide?
List the 3 parts of a nucleotide
Phosphate
Sugar
Nitrogen Base

4. More base pairing
T T A G C T C T
A A T C G A G A

5. 5 Steps to DNA Replication
Enzyme initiates (starts) replication and untwists the helix

6. Step 2:
DNA unzips

7. Step 3: Free Nucleotides attach (the nucleotides bind to the unzipped DNA strands)

8. Enzymes check for errors
A T
G C
A G
C G
Step 4:
Enzymes check for errors
A G T

9. Step 5:
Enzymes twist the
new strands (creating the double helix)
Results:
2 identical copies

10. 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

11. Semi-Conservative Replication
Original DNA
Original DNA
New DNA