2.3 Lipids

_State the role of Lipids( Grade C) _Describe the structure of the triglycerides(Grade B) _Describe the difference between saturated and unsaturated fatty acids(Grade A) _Explain how the structure relates function (Grade A/A)

Phospholipids contribute to the flexibility of membranes and the transfer lipids soluble substances.

Provide more then twice the energy as the same of carbohydrates and release valuable water.

Lipids are insoluble in water. Plants an insects have waxy, lipids cuticles that conserve water. Mammals produce oily sections from glands in the skin.

Fats are slow conductors of heat ad stored beneath the body surface they help to conserve body heat. they also act as electric insulation around the nerve.

fat is often stored around delicate organs , such as the kidney.

1 glycerol molecules and 3 fatty acids

Joined together in a condensation reactions(3 water molecules are released per triglyceride as 3 bonds are formed.

The bonds formed are Ester bonds(Not glycosidic bonds) The ester bonds are broken down by Hydrolysis.

The chemical break down of a compound due to reaction with water.

Unsaturated fatty acids Saturated fatty acids

Fats Oils Phospholipids

tending to repel or fail to mix with water