Final answer:
Cellulose is a carbohydrate (option 3) that serves as a structural component in plant cell walls, made up of glucose units linked by beta-1,4-glycosidic bonds.
Step-by-step explanation:
Cellulose is an example of a carbohydrate polymer. This natural polymer is a crucial structural component of the cell walls of plants and certain algae. Cellulose is comprised of glucose monomers that are linked together through β-1,4-glycosidic bonds.
Unlike starch which is also made of glucose and serves as energy storage, cellulose's straight, unbranched chains give it the strength necessary for maintaining the structure of cell walls.
Carbohydrates are vital energy sources for cells and provide structural support to organisms. Cellulose, which is found in the cell walls of plants, is a linear polymer made of glucose units linked by glycosidic bonds.