Lipids Flashcards
1
Q
What do lipids contain?
A
Contain carbon, hydrogen, and oxygen and are insoluble in water
2
Q
how are lipids hydrolysed
A
They are hydrolysed by heating with an acid/alkali or using lipase and optimum temp. + pH
3
Q
Lipids Test
A
- Add small amount of sample to Ethanol
- Shake the mixture so the fat dissolves
- Add the mixture to water and mix
- Positive = Cloudy white emulsion
4
Q
describe the structure of phospholipids and what bonds they form?
A
- 2 fatty acids and a phosphate group are attached to glycerol
- Hydrophobic tails , Hydrophilic head
- Forms ester bonds
5
Q
what do phospholipids form in water
A
Bi-layers or micelles
6
Q
what do triglycerides consist of and what bonds do they form?
A
- 3 fatty acids attached to glycerol
- Forms ester bonds
7
Q
Triglyceride Properties (3)
A
- Osmotically inactive
- High proportion of carbon-hydrogen bonds = release 2x energy than carbohydrates in respiration
- High ratio of Hydrogen to Oxygen so it releases water when respired
