DNA - Deoxyribonucleic Acid - A, G, C and T - sugar deoxyribose
RNA - Ribonucleic Acid - A, G, C and U - sugar ribose
Made of chains of nucleotides which make polynucleotides, joined by covalent bonds between phosphate and sugar molecules to form a 'backbone'.
Nucleotide - Made of pentose sugar (5 Carbon Atoms), Phosphate, Nitrogenous Base.
Bases - Purines (Adenine and Guanine, double ring of carbon and Nitrogen atoms) and Pyramidines (Thymine, Cytosine and Uracil, single ring...).
DNA is a Double Helix - Made of two polynuecleotides held togther by H bonds, arranged so Purine is opposite Pyramidine (A:T, G:C), A+T have 2 H bonds, G+C have 3 H bonds, the two polynucleotides are antiparallel.
DNA is stable info is stored for a long time, large molecule stores lots of info, two polynucleotides act as template for synthesis of new polynucleotide during replication.
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