2.3 Lipids

Question 1

Learning outcomes

Answer 1

_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)

Question 2

Roles of Lipids_Cell membrane

Answer 2

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

Question 3

Roles of Lipids_Source of energy

Answer 3

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

Question 4

Roles of Lipids_Waterproofing

Answer 4

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

Question 5

Roles of Lipids_Insolation

Answer 5

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.

Question 6

Roles of Lipids_protection

Answer 6

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

Question 7

Structural formular of triglycerides

Answer 7

1 glycerol molecules and 3 fatty acids

Question 8

Reaction

Answer 8

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

Question 9

Bonds

Answer 9

The bonds formed are Ester bonds(Not glycosidic bonds)

The ester bonds are broken down by Hydrolysis.

Question 10

hydrolysis

Answer 10

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

Question 11

Types of fatty acids

Answer 11

Unsaturated fatty acids

Saturated fatty acids

Question 12

Three main types of lipids

Answer 12

Fats
Oils
Phospholipids

Question 13

Hydrophobic

Answer 13

tending to repel or fail to mix with water