A nucleotide in the DNA chain consists of three parts: a nitrogenous base, a phosphate group, and a molecule of deoxyribose. The nitrogenous bases of each nucleotide chain are of two major types: purines and pyrimidines . Purine bases have two fused rings of carbon and nitrogen atoms,
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This note was uploaded on 12/07/2011 for the course BIOLOGY bi 101 taught by Professor - during the Fall '10 term at Montgomery.