Which of the following is a monosaccharide?

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Multiple Choice

Which of the following is a monosaccharide?

Explanation:
This item tests the distinction between monosaccharides and disaccharides. A monosaccharide is a single sugar unit that cannot be broken down into smaller sugars. Glucose fits this definition as a simple sugar (an aldohexose) present as one unit. The other options are disaccharides, each built from two monosaccharide units: sucrose (glucose + fructose), maltose (two glucose units), and lactose (glucose + galactose). Disaccharides must be digested to yield monosaccharides before absorption. Therefore, glucose is the monosaccharide.

This item tests the distinction between monosaccharides and disaccharides. A monosaccharide is a single sugar unit that cannot be broken down into smaller sugars. Glucose fits this definition as a simple sugar (an aldohexose) present as one unit. The other options are disaccharides, each built from two monosaccharide units: sucrose (glucose + fructose), maltose (two glucose units), and lactose (glucose + galactose). Disaccharides must be digested to yield monosaccharides before absorption. Therefore, glucose is the monosaccharide.

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