2. DNA Obj 15!!!! Explain how mutations can happen to DNA in your cells.

3. DNA It’s in ALL living things Interface between chemistry and life Easily understood molecule It doesn’t ‘do’ anything Its structure IS its function

4. Review Electronegativity O, N, H, C

5. Review

6. Electronegativity O, N, H, C Covalent Bond Hydrogen ‘bond’ (interaction)

7. DNA ‘Simple’ Structure Double Helix fotolibra.com

8. DNA What MUST it do? Role in Heredity Store, Copy and Transmit information Its simplicity allows for this fotolibra.com

9. DNA Store information It IS your ‘genes’ Copy information The bases will pair with themselves! Transmit information It’s what chromosomes are made of! fotolibra.com

10. DNA The bases Adenine “A” Guanine “G” Cytosine “C” Thymine “T” fotolibra.com

11. Basil Oregano Salt Garlic

12. Basil Oregano Salt Garlic

13. Adenine Guanine Cytosine Thymine

14. Nucleotide Sugar, phosphate and a base

15. Where are the covalent and hydrogen bonds? Figure 12.7

16. DNA A ‘goes with’ T G ‘goes with’ C How many H-bonds? How many ‘rings’ across is each pair? Important? fotolibra.com

17. DNA How difficult would it be for A to pair with G? C to T? A to C? G to T? fotolibra.com

18. Homework Read AND note 12.3