DNA Structure. Will Fagan IB Biology 2011. 3.3 DNA Structure. DNA- Deoxyribonucleic acid Each nucleotide of DNA is composed of a phosphate group, a sugar called deoxyribose and a molecule that is called a nitrogenous base. . Nitrogenous Bases . Adenine Thymine Guanine Cytosine
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IB Biology 2011