Monosaccharides
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A monosaccharide is a single simple sugar, the basic monomer that carbohydrates are built from.
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Glucose, galactose, and fructose are all monosaccharides sharing the same chemical formula but differing in the arrangement of their atoms.
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Sharing a chemical formula does not make two monosaccharides identical — their differing atomic arrangement changes how the body uses each one.