1. 13.2 Replication of DNA I. DNA Copied
A. Replication – creating new DNA copy
1. DNA must unwind
a. DNA helicases – enzymes that unzip DNA
2. Replication fork – where DNA separates and copies itself
3. DNA polymerase moves along both sides of unzipped DNA
a. creates 2 new DNA strands
b. continues to copy until signaled to stop
c. does contain a proofreading feature that allows to backspace and correct errors

3. 4. DNA is not copied from one end to other end
a. this would take 16 days to copy a single DNA molecule of a fruit fly
b. instead it only takes 3 minutes with thousands of replication bubbles occurring at once
c. in humans it would take 33 days to replicate a chromosome
d. instead it takes only around 8 hours

4. II. Prokaryotic & Eukaryotic Replication
A. In prokaryotes replication starts at a single site & in eukaryotes it starts in thousands of sites at once