Functions of Lipids

Question 1

Name the 7 functions of lipids

Answer 1

Energy Source and Storage, Protection, Oxidation, Membranes, Waterproofing, Insulation, Hormones

Question 2

Why are lipids a good source and store of energy?

Answer 2

1g of fat provides 2x the energy of 1g carbohydrate. Lipids are stored in adipose cells in fat stores.

Question 3

How do lipids perform protection?

Answer 3

They protect delicate internal organs like kidneys from physical damage.

Question 4

What is the function of lipids in oxidation?

Answer 4

Oxidation of triglycerides produces metabolic water (v. useful for desert animals).

Question 5

What is the function of lipids in membranes?

Answer 5

Phospholipids are important components of all biological membranes.

Question 6

What is the function of lipids in waterproofing?

Answer 6

(Waxes and oils) e.g. leaves have a waxy cuticle to reduce water loss.

Question 7

What is the function of lipids in insulation?

Answer 7

Fats are poor conductors of heat (they retain body heat). They also provide electrical insulation around long nerve cells (e.g. Myelin Sheath around neurons).

Question 8

What is the function of lipids in hormones?

Answer 8

Some hormones are lipids.