1. Warm-up- Use your notes! 1. Which nitrogen base (T, A, C, or G) compliments with C? 2. Which nitrogen base matches with T? 3. Do the nitrogen bases bond to the sugar molecule (larger) or the phosphate molecule? 4. Name 2 of the 3 scientists that helped with the discovery of DNA. What did they do? 5. Is DNA copied inside of your cells? 6. Draw a sketch of DNA

2. DNA REPLICATION

3. DNA Replication  Process of DNA making a copy to prepare for mitosis and meiosis.  Semiconservative model-  Occurs during Interphase Of the cell cycle Of the cell cycle

4.  Enzymes- proteins with a “special job”  DNA polymerase adds nitrogen bases to open strand  Helicase separates the strand

5. DNA Replication Animation  http://www.pbs.org/wgbh/evolution/ library/06/3/l_063_02.html http://www.pbs.org/wgbh/evolution/ library/06/3/l_063_02.html http://www.pbs.org/wgbh/evolution/ library/06/3/l_063_02.html DNA Replication Simulation  Base pair sequence- A-C-T-A-G-C