1. DNA 12-1

2. Griffith’s Experiment Involved injecting mice with various strains of bacteria (pneumonia causing and non pneumonia causing strains) Led the way for Oswald Avery to determine DNA was responsible for transformation – Made two extracts from heat treated bacteria (one with enzymes that destroys proteins, lipids, carbs and one with enzymes that destroy DNA)

4. Hershey-Chase Experiment Determined which part of a virus is the cause of illness Treated viruses with radioactive chemicals (sulfur/phosphorous) to follow along Showed that viral DNA inserted into host cells

5. Components of DNA Made up of molecules called nucleotides – Adenine – Thymine – Guanine – Cytosine Nucleotides can be joined together in any order (any number of combinations are possible) Combinations of nucleotides creates DNA found in every living thing

6. The Double Helix Watson and Crick – Discovered the double helix shape of DNA in 1953 Base pairing – The concept that hydrogen bonding exists between certain nucleotides (adenine to thymine, guanine to cytosine)

7. Activity Draw a molecule of DNA Show the base pairing that exists in DNA Write a one paragraph summary that details the important information from the notes Compare your summary with someone else in the class.