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Which sugars are important components of RNA and DNA?

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A biochemical flowchart shows the metabolic pathways for carbohydrate utilization, including glycolysis, the pentose phosphate pathway, and the tricarboxylic acid (TCA) cycle. The diagram traces the conversion of glucose, fructose, and glycerol through various intermediates, leading to energy production, carbon dioxide release, and biosynthesis of amino acids and porphyrins. Key steps and branches are labeled, with colored boxes highlighting biosynthetic outputs. — Carbohydrate Pathways for the utilization of carbohydrates.

The sugars that serve as essential components of DNA and RNA are both five-carbon pentose sugars that form the structural backbone of these nucleic acids.

DNA: The sugar component is 2′-deoxyribose. It is distinguished by the absence of a hydroxyl group on the 2′ carbon of the sugar ring.12
RNA: The sugar component is ribose. Unlike deoxyribose, ribose contains a hydroxyl group at the 2′ position.13

These sugars alternate with phosphate groups to create the polymer backbone, providing the structural framework to which nitrogenous bases attach to form nucleotides.123