1.Lipids

Question 1

What does a saturated fatty acid have?

Answer 1

Single carbon to carbon bond.

Question 2

What does an unsaturated fatty acid have?

Answer 2

Carbon to carbon double bond
as double bonds increase, mp of lipid decreases.

Question 3

How are triglycerides formed?

Answer 3

condensation of glycerol and 3 fatty acids. form 3 ester bonds between glycerol and fatty acid. (COOH)

Question 4

How are phospholipids formed?

Answer 4

condensation of glycerol, 2 fatty acids (unsaturated and saturated) and phosphate. make 2 ester bonds. (COOH)

Question 5

Compare phospholipids and triglycerides

Answer 5

Both insoluble in water. Triglycerides hydrophobic but phospholipids are hydrophillic and hydrophobic so will form bilayer in water
Triglycerides 3 fatty acids so 3 ester bonds, phospholipids 2 fatty acids, 1 phosphate and 2 ester bonds.

Question 6

What are uses of lipids?

Answer 6

used as insulation, cell membrane and storage.

Question 7

What is the emulsion test for lipids?

Answer 7

ethanol + water , shake, white emulsion.