1
Q
Uses of lipids;
A
- steroid hormones
- source of cholesterol
- insulation of neurones
- membranes
- protection of organs
- thermal insulation
- stores energy/ biological fuel
2
Q
Describe saturated fatty acids
- and example
A
- maximum hydrogen bonds
- solid at room temperature
- eg palmitic acid
- single carbon bonds
3
Q
Describe unsaturated fatty acids
- and example
A
- double bond carbon
- not fully saturated with hydrogen
- liquid at room temperature
- double bond causes a kink in structure
- linoleic acid
4
Q
Describe a triglyceride
A
- glycerol + 3 fatty acids
- 3 ester bonds
- created through condensation
5
Q
Describe phospholipids (5)
A
- two fatty acids tail
- phosphate head
- amphipathic; hydrophilic head, hydrophobic tail
- Contains glycerol
- ester bonds
6
Q
Describe cholesterol
A
- amphipathic; OH group polar head phospholipid
Hydrocarbon end hydrophobic
7
Q
Briefly describe lipids
A
- insoluble in water
- oily/ greasy/ waxy consistency
- water repelling
8
Q
What are the three types of lipids?
A
- triglycerides
- phospholipids
- steroids
9
Q
Describe a fatty acid
A
- carboxylic acid
- carboxyl group (COOH) and hydrocarbon chain
