I. DNA
Deoxyribonucleic Acid Carries all heredity information Gene: segment of DNA that controls the production of a specific protein
D. Nucleotide: subunit of DNA Composed of – Sugar: deoxyribose Phosphate Nitrogen base: Adenine (A) Thymine (T) Cytosine (C) Guanine (G) http://en.wikipedia.org/wiki/Image:DNA_orbit_animated.gif
Shape: Double helix (twisted ladder) Sides of ladder: Sugar Phosphate Rungs: Pair of Nitrogen bases Paired bases: Adenine – Thymine Guanine – Cytosine Hydrogen Bonds between bases
II. Nitrogen Bases: Two Groups: Purines: A and G Pyrimidines: C, T, U