Which compound is a disaccharide?

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Disaccharides are carbohydrates formed when two monosaccharide units are joined by a glycosidic bond. Hydrolysis of a disaccharide yields two monosaccharides. Here, glucose and fructose are each single sugar molecules, so they are monosaccharides. Cellulose is a polymer made of many glucose units, which makes it a polysaccharide. Sucrose, on the other hand, links glucose and fructose together, forming two monosaccharide units in one molecule, so it is the disaccharide.