Starch

• Cells get energy from glucose. Plats store excess glucose.
• Starch is a mixture of two alpha-glucose molecules - amylose and amylopectin.
• Amylose is a long, unbranched chain of alpha-glucose. The angles of the glycosidic bonds give it a coiled structure, almost like a cylinder. This makes it compact, so it is really good for structure because you can fit more into a small space.
• Amylopectin is a long, branched chain of alpha-glucose. Its side branches allow the enzymes that break down the molecule to get at the glycosidic bonds easily. This means that glucose can be released quickly.
• Starch is insoluble in water, so it doesn't cause water to enter the cells by osmosis which would make them swell. This makes it good for storage.