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2.  Chemical Composition  Carbon, hydrogen, oxygen, nitrogen and phosphorus  Monomer  Nucleotide Sugar Phosphate Nitrogen base

3.  DNA  Double stranded  Sugar = Deoxyribose  Bases = A, T, C, G  Nucleus  RNA  Single stranded  Sugar = Ribose  Bases = A, U, C, G  Cytoplasm

4.  Directs the cells activities  Contain heredity information

5. 5 end Nucleoside Nitrogenous base Phosphate group Sugar (pentose) (b) Nucleotide (a) Polynucleotide, or nucleic acid 3 end 3C3C 3C3C 5C5C 5C5C Nitrogenous bases Pyrimidines Cytosine (C) Thymine (T, in DNA)Uracil (U, in RNA) Purines Adenine (A)Guanine (G) Sugars Deoxyribose (in DNA) Ribose (in RNA) (c) Nucleoside components: sugars