DNA Replication

Base pairing G A C T A G A T C T G A T C T A

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

More base pairing T T A G C T C T A A T C G A G A

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

Step 2: DNA unzips

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

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

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

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

Semi-Conservative Replication Original DNA Original DNA New DNA