Which of the following groups are all classified as polysaccharides? A. glycogen, cellulose and starch C. maltose, lactose and fructose B. glycogen, sucrose and maltose D. sucrose, glucose and fructose

The correct answer is A. glycogen, cellulose and starch. These are all classified as polysaccharides. Polysaccharides are carbohydrates with three or more monosaccharides or simple sugars. Glycogen is a storage form of glucose in animals and humans which is analogous to the starch in plants. Cellulose is a structural component of the primary cell wall of green plants. Starch is a polysaccharide in green plants consisting entirely of glucose.

On the other hand, maltose, lactose, sucrose, glucose, and fructose are all disaccharides or monosaccharides, not polysaccharides. Maltose (a disaccharide) is composed of two units of glucose. Lactose (a disaccharide) is composed of glucose and galactose. Sucrose (a disaccharide) is composed of glucose and fructose. Glucose and fructose are monosaccharides, or simple sugars.