Biology / Bio 1203 · Atom · ~20 seconds
The Nucleotide
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A DNA nucleotide is built from a deoxyribose sugar, a phosphate group, and one of four nitrogenous bases: adenine, thymine, guanine, or cytosine.
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Alternating sugar and phosphate groups form each strand's backbone, with one base attached to each sugar.
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A nucleotide's base identifies it — the sugar and phosphate are identical across all four DNA nucleotide types.