Lipids

Question 1

What are the components of fats?

Answer 1

3 Fatty acid tails + glycerol

-ester linkage (O-C=O)

Question 2

Saturated f.a VS unsaturated f.a

Answer 2

Saturated: all C bonded to at least 2 H atoms

Unsaturated: double bond bt C atoms
-kinks

Question 3

Function of kinks

Answer 3

1. Determining fluidity and MP

2. Prevent the molecules from packing too close tgt

Question 4

What are the functions of simple lipid?

Answer 4

1. Effective source of energy
   - higher energy value than carbo. per unit mass due to more C atom
2. Effective source of water
   - metabolic water is obtained when triglyceride is oxidised in aerobic respiration
   - 1g of tri has 2x more H
3. Thermal insulating material
   - conducts heat very slowly
   - beneath skin as subcutaneous fat prevents excessive heat lose
4. Provide buoyancy
   -less dense than water
   => float on water

Question 5

What are the components of lipids?

Answer 5

• 2f.a attached to glycerol

- third hydroxyl group is joined to a phosphate group

Question 6

What is the unique feature of phospholipid?

Answer 6

• ambivalent character
• self assembly => bilayers

-choline attached