Final answer:
The three important polysaccharides in nutrition are starch, glycogen, and cellulose. Starch is easily digested and stored in plants, glycogen is the primary energy-storage molecule in animals and bacteria, and cellulose is a structural component in cell walls.
Step-by-step explanation:
Polysaccharides are long polymers composed of multiple monosaccharide units joined by glycosidic linkages. The three most important polysaccharides are starch, glycogen, and cellulose.
Starch is a homopolymer of glucose that is stored in plant-based foods and can be easily digested.
Glycogen is a branched polymer of glucose and functions as the primary energy-storage molecule in animals and bacteria.
Cellulose is a linear chain of glucose molecules and serves as a structural component in plant and other organism cell walls.