Which of the following are examples of polysaccharides?

• A. Sucrose and lactose
• B. Glycerol and fatty acids
• C. Glucose and fructose
• D. Starch and cellulose

Answer: (D)

Verified step by step guidance

1. Understand the definition of polysaccharides: Polysaccharides are large, complex carbohydrates composed of long chains of monosaccharide units linked together by glycosidic bonds. They serve as energy storage (e.g., starch) or structural components (e.g., cellulose) in organisms.
2. Review the examples provided in the question: Sucrose and lactose are disaccharides, which consist of two monosaccharides linked together. Glycerol and fatty acids are components of lipids, not carbohydrates. Glucose and fructose are monosaccharides, which are single sugar units.
3. Identify starch and cellulose as polysaccharides: Starch is a storage polysaccharide found in plants, composed of glucose units. Cellulose is a structural polysaccharide found in plant cell walls, also composed of glucose units but with a different bonding arrangement.
4. Explain why starch and cellulose fit the definition of polysaccharides: Both are made up of long chains of glucose molecules, making them polysaccharides. Starch is used for energy storage, while cellulose provides structural support.
5. Conclude that starch and cellulose are the correct examples of polysaccharides based on their structure and function, distinguishing them from the other options provided in the question.