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nucleotide

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nucleotide

Organic compound consisting of a purine (adenine or guanine) or a pyrimidine (thymine, uracil, or cytosine) base linked to a sugar (deoxyribose or ribose) and a phosphate group. DNA and RNA are made up of long chains of nucleotides.

A nucleoside, by contrast, contains only the base and the sugar. Thus, the base adenine plus ribose makes the nucleoside adenosine, whose phosphates, including the energy carrier ATP (adenosine triphosphate), are nucleotides.



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