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DNA Is a Structure That Encodes Biological Information At the most basic level, all DNA is composed of a series of smaller molecules called nucleotides.In turn, each nucleotide is itself made up of three primary components: a nitrogen-containing ... What are the Three Main Parts of a Nucleotide? - BYJU'S There are a total of five bases found in the DNA and RNA world, namely - Adenine (A), Cytosine (C), Guanine (G), Thymine (T) and Uracil (U). A, T, C and G are found in DNA molecules whereas the uracil base is found in RNA molecules in place of the thymine. Phosphate Group Nucleotide - Genome A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T). In RNA, the base uracil (U) takes the place of thymine. Three parts of a nucleotide