1. I. DNA

2. Deoxyribonucleic Acid
Carries all heredity information
Gene: segment of DNA that controls the production of a specific protein

3. D. Nucleotide: subunit of DNA
Composed of –
Sugar: deoxyribose
Phosphate
Nitrogen base:
Adenine (A)
Thymine (T)
Cytosine (C)
Guanine (G)

4. 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

8. II. Nitrogen Bases:
Two Groups:
Purines:
A and G
Pyrimidines:
C, T, U