Which statement correctly describes cellulose and starch?

Which statement correctly describes cellulose and starch?

• A. They are polymers of glucose
• B. They are lipids
• C. They are disaccharides
• D. They are proteins

Answer: (A)

The main idea is that cellulose and starch are polymers of glucose. Both are carbohydrates built from many glucose units linked by glycosidic bonds, making them polysaccharides. Starch stores energy in plants and uses mainly alpha-linked glucose, while cellulose provides structural support with beta-linked glucose, which also explains the difference in digestibility. They are not lipids, disaccharides, or proteins—lipids are fats, disaccharides are two-sugar units, and proteins are polymers of amino acids. So, being polymers of glucose is the correct description for both.

The main idea is that cellulose and starch are polymers of glucose. Both are carbohydrates built from many glucose units linked by glycosidic bonds, making them polysaccharides. Starch stores energy in plants and uses mainly alpha-linked glucose, while cellulose provides structural support with beta-linked glucose, which also explains the difference in digestibility. They are not lipids, disaccharides, or proteins—lipids are fats, disaccharides are two-sugar units, and proteins are polymers of amino acids. So, being polymers of glucose is the correct description for both.