Lifestyle, Health and Risk (biologoical molecules) Exam Qs

Assess the relative importance of carbohydrates to plants and animals (9)

The fatty acids shown on the diagram are saturated
Describe how the diagram would be different in one of the fatty acids was unsaturated (2)

• double bond between carbon atoms (in the fatty acid chains)

• a kink in the fatty acid chain

Explain how the structure of glycogen allows it to be an energy store (3)

Describe the reaction that joins two a-glucose molecules to form a disaccharide (2)

Insect flight uses a lot of energy. Explain the advantage of insects storing both trehalose and glycogen (4)

Compare and contrast the structure of a disaccharide with glycogen (4)

• hydrolysis

• of glycosidic bonds