1. THE ROLE OF DNA AND BACTERIA

2. DO NOW 4 minutes and 27 seconds to write down 5 things from last class Do NOT use your notes

3. HOMEWORK Review Worksheet due today The Role of DNA

4. HOMEWORK DUE TOMORROW Read pg. 344-348 The Structure of DNA Answer Questions 1 & 2 on pg. 348

5. REVIEW Griffith’s Experiments Mice What were his experiments? What were his conclusions?

6. REVIEW Oswald Avery What did he base his experiments off? What were his conclusions?

7. BACTERIAL VIRUSES Bacteriophage is a virus that infects bacteria Bacteriophage attaches to the bacterial cell and injects genetic information Viral gene now produces more bacteriophages and destroys the bacterial cell Are these good? The Food and Drug Administration FDA has approved the use of some bacteriophages to use on food Used to treat ready to eat meat and poultry dishes

8. HERSHEY-CHASE EXPERIMENT Experiments thus far had looked into the genetic makeup of viruses and bacteria, but what part of the bacteriophage enters the bacterial cell? Viruses made up of protein coat and DNA Which part enters the cell? Grew viruses with radioactive phosphorus (P) and radioactive sulfur (S) Protein contains no phosphorus, DNA contains no sulfur After mixing, found the radioactive phosphorus inside the bacterial cells

9. ROLE OF DNA Store Information Must carry the information to make things the way they are Ex: Eye color, hair color, flower color Copy Information Before cell division, must copy every gene Transmitting Information Mendel’s work showed that genes are transmitted from one generation to the next Loss of DNA probably means a loss of valuable genetic information

10. BILL NYE – GENES! http://www.youtube.com/watch?v=OZIQTMHmWmg

11. HOMEWORK DUE TOMORROW Read pg. 344-348 The Structure of DNA Answer Questions 1 & 2 on pg. 348