Reducing sugars are:
Correct answer: A. Glucose, fructose, galactose, maltose, and lactose
- A. Glucose, fructose, galactose, maltose, and lactose
- B. Glucose, sucrose, and cellulose
- C. Lactose, starch, glycogen, and trehalose
- D. Sucrose
Explanation
Reducing sugars are those sugars that can donate electrons to another chemical, effectively reducing it, while they themselves become oxidized. This property is due to the presence of a free aldehydic or ketonic group. All monosaccharides are reducing sugars, as are some disaccharides, such as maltose and lactose, which have a free anomeric carbon. Sucrose does not exhibit this behavior because both anomeric carbons are involved in the glycosidic bond, rendering it non-reducing. Similarly, polysaccharides like starch and cellulose lack free anomeric carbons needed for reduction.
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