Lipids Flashcards
1
Q
Lipids are a diverse…
A
group of chemicals.
2
Q
Most common are…
A
triglycerides = fats(solid) and oils (liquid)
3
Q
Lipids contain elements….
A
C,H and O
4
Q
Triglycerides are made of…
A
three fatty acid molecules and one glycerol molecule
5
Q
Fatty acids have…
A
-COOH group attached
6
Q
Glycerol is…
A
alcohol.
7
Q
Fatty acids joins to glycerol by…
A
condensation, forming ester bonds between two C. The final product is glyceride.
8
Q
Properties of triglycerides
A
- insoluble in water
- soluble in organic solutions e.g. ethanol or chloroform
- non-polar and hydrophobic
9
Q
Why is triglyceride soluble in organic solution?
A
Due to the long hydrocarbon tails of fatty acids.
10
Q
Roles of triglycerides
A
- energy reserve
- insulator
- buoyancy (whales)
- metabolic source of water (desert kangaroo rat)
11
Q
Why the triglycerides are good energy reserve?
A
Contain many C-H bonds, more than carbs.
12
Q
Unsaturated lipids
A
- have double bond between neighboring carbon atoms
- do not contain the maximum possible amount of H
- double bond make lipids melt more easily
13
Q
Saturated lipids
A
- no double bond
- animal lipids
14
Q
Double bond in unsaturated fatty acids causes…
A
bending.
15
Q
Phospholipids
A
- each molecule has one end which is soluble in water
- one of the fatty acids is replaced by phosphate group(hydrophilic head)
- hydrophobic tails
