Which monosaccharides combine to form the disaccharide Sucrose?

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Multiple Choice

Which monosaccharides combine to form the disaccharide Sucrose?

Disaccharides form through a glycosidic linkage between the anomeric carbons of two monosaccharides. For sucrose, the linkage ties the anomeric carbon of glucose (C1) to the anomeric carbon of fructose (C2), creating an α-1,2 glycosidic bond. This connection uses up both anomeric carbons, so sucrose has no free carbonyl group and is a non-reducing sugar. That’s why the disaccharide is formed specifically from glucose and fructose. By contrast, lactose is glucose linked to galactose, and maltose is glucose linked to another glucose; those combinations form different disaccharides. Invert sugar describes the mixture obtained when sucrose is hydrolyzed into glucose and fructose, not the structure of sucrose itself.

Disaccharides form through a glycosidic linkage between the anomeric carbons of two monosaccharides. For sucrose, the linkage ties the anomeric carbon of glucose (C1) to the anomeric carbon of fructose (C2), creating an α-1,2 glycosidic bond. This connection uses up both anomeric carbons, so sucrose has no free carbonyl group and is a non-reducing sugar. That’s why the disaccharide is formed specifically from glucose and fructose. By contrast, lactose is glucose linked to galactose, and maltose is glucose linked to another glucose; those combinations form different disaccharides. Invert sugar describes the mixture obtained when sucrose is hydrolyzed into glucose and fructose, not the structure of sucrose itself.

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