Write four examples of disaccharides and polysaccharides.

Disaccharides:

1. Sucrose: It is a disaccharide composed of glucose and fructose. It is commonly known as table sugar.
2. Lactose: It is a disaccharide found in milk and is composed of glucose and galactose.
3. Maltose: It is a disaccharide composed of two glucose molecules. It is produced when starch breaks down.
4. Trehalose: It is a disaccharide composed of two glucose molecules. It is found in some fungi, plants, and invertebrate animals.

Polysaccharides:

1. Starch: It is a polysaccharide composed of glucose units and is the main form of energy storage in plants.
2. Glycogen: It is a polysaccharide composed of glucose units and is the main form of energy storage in animals.
3. Cellulose: It is a polysaccharide composed of glucose units and is a major component of the cell walls in plants.
4. Chitin: It is a polysaccharide composed of N-acetylglucosamine units and is found in the exoskeleton of insects and crustaceans.