3.1.3 lipids Flashcards
1
Q
A
2
Q
What are the two groups of lipids?
A
Phospholipids and triglycerides
3
Q
How are triglycerides formed?
A
The condensation of one molecule of glycerol and three molecules of fatty acids the bonds formed are called ester bonds
4
Q
What is the structure of a fatty acid?
A
- Every fatty acid has a carboxylic acid and a methyl end
- The middle of the fatty acid is a hydrocarbon chain, they can be saturated where they have no carbon carbon double bonds or unsaturated where they have one C-C double bond or polysaturated when they have more than one
5
Q
What is the structure of a phospholipid?
A
One of the fatty acids of a triglyceride is substituted by a phosphate group
6
Q
How do you test for the presence of lipids?
A
Add ethanol shake and if cloudy suspension appears then lipids are present
7
Q
What are the different properties of triglycerides and phospholipids?
A
- Phospholipids are hydrophobic and hydrophilic allowing it to form the cell membrane whereas triglycerides are hydrophobic making them an energy store
- Phospholipids are fluid, saturated fatty acids found in animals aren’t fluid, unsaturated fatty acids found in plants are fluid
