1. Definitely essential acid-linoleic acid.

2. Essential fatty acids:

a) Arachidonic acid

b) Linolenic acid

c) Linoleic acid

3. Storage form of lipids is triglycerides.

4. Examples of glycolipids:

a) Cerebrocides

b) Ganagliosides

5. Examples of phospholipids:

a) Lecithin

b) Cephalin

c) Sphingomyelin

6. Choline is important component of lecithin and sphingomyelin.

7. The process by which when exposed to atmosphere edible fats become autotoxicated and give bad odour is called rancidity.

8. Process of alkali hydrolysis of fats is called saponification.

LIPID METABOLISM

• Dietary fat is absorbed mainly by the lymphatics in the form of chylomicrons after digestion
• Chylomicrons are the important mode of transport for plasma lipids.
• Free fatty acids form loose complex with plasma albumin and are transported along with proteins.
• Initial step of beta oxidation is activation of fatty acids with ATP and CoA to form acetyl thioester of CoA.
• Starting material for synthesis of cholesterol is acetyl CoA.
• Starting material for synthesis of ketones is acetyl CoA.
• Lipotropic factors are those that prevent the accumulation of fats in liver. They are choline, leuthine and methionine.
• All the enzymes involved in beta-oxidation are present in mitochondria.