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The carbohydrate in DNA is deoxyribose.

More fully, the name is beta-D-2-deoxyribose.

DNA is a polymer of nucleotides. Each nucleotide consists of a phosphate group, a molecule of deoxyribose, and one of four bases.

Deoxyribose is a pentose sugar (it has five carbon atoms). In DNA the sugar residue includes a five-membered ring comprising four of the carbons and one oxygen atom. The fifth carbon is attached to one of the other carbons.

Deoxyribose takes its name from ribose (the sugar in RNA). Ribose has a hydroxyl group on carbon 2 ( -CHOH- ) but deoxyribose lacks this hydroxyl group and therefore has one oxygen atom fewer than ribose. The DNA carbon 2 (designated 2' in the nucleotide because the numbering begins in the base) carries two hydrogen atoms ( -CH2- ).

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