Lipids Flashcards
1
Q
How are triglycerides formed
A
condensation of one molecule and three fatty acids
2
Q
what forms an ester bond
A
condensation reaction between glycerol and a fatty acid (RCOOH) forms an ester bond
3
Q
What does saturated mean
A
no double bond between carbon atoms
4
Q
what does unsaturated mean
A
double bond between carbon atoms
5
Q
what is a phospholipid formed from
A
glycerol, two fatty acids and one phosphate containing group
6
Q
structure and function of a phospholipid
A
hydrophilic heads and hydrophobic tails - acts as a barrier for water soluble molecules
- control fluidity of cell - more saturated tails = less fluid
7
Q
structure and function of a triglyceride
A
- many carbon - hydrogen bonds with little oxygen > release a lot of energy when oxidised
- store more energy per gram than carbohydrates
- ## hydrophobic so don’t cause osmotic water uptake
8
Q
what is the emulsion test
A
add ethanol and shake
milky white emulsion
9
Q
what way do phospholipids face in a bilayer
A
- heads point out
- tails in
