1. DNA Pages 290-291

2. DNA -genetic information that is passed from parent to offspring Discovered by Watson & Crick (1953) Looks like a “twisted ladder” (Double Helix)

3. Structure of DNA Sides of the ladder are made up of a sugar & a phosphate molecule -Green molecule is the Sugar (aka Deoxyribose) -Yellow molecule is the phosphate.

4. DNA Structure Cont… “Rungs of the Ladder” are made up of 4 nitrogen bases A – Adenine T – Thymine G – Guanine C - Cytosine Adenine pairs with Thymine (A –T) Guanine pairs with Cytosine (G – C) So how can we remember how DNA bases pair up… “ At The Grand Canyon”