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

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

Review Electronegativity O, N, H, C

Review

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

DNA ‘Simple’ Structure Double Helix fotolibra.com

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

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

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

Basil Oregano Salt Garlic

Basil Oregano Salt Garlic

Adenine Guanine Cytosine Thymine

Nucleotide Sugar, phosphate and a base

Where are the covalent and hydrogen bonds? Figure 12.7

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

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

Homework Read AND note 12.3