lipids

Question 1

how are phospholipids arranged in a bilayer?

Answer 1

1. hydrophobic tails (non-polar) point towards centre of bilayer 2. hydrophilic heads (polar) point outwards away from bilayer 3. forms a barrier to water soluble molecules

Question 2

how are triglycerides formed?

Answer 2

1. 1 gylcerol, 3 fatty acids
2. held together by ester bonds
3. formed in condensation reactions

Question 3

what are the functions of triglycerides?

Answer 3

1. source of energy
2. insulation - slow conductor of heat, helps retain body heat
3. waterproofing - insoluble in water
4. protection - fat is stored around delicate organs and acts as shock absorber

Question 4

how is a phospholipid formed?

Answer 4

1. 1 glycerol molecule, 2 fatty acids, phosphate group
2. held together by ester bonds
3. formed in condensation reactions