lipids - 1

Question 1

what do lipids all contain

Answer 1

hydrocarbons

Question 2

2 types of lipids we need to know

Answer 2

phospholipids
triglycerides

Question 3

what are triglycerides made up of

Answer 3

one molecule of glycerol
three fatty acid tails

Question 4

are the fatty acid tails hydrophobic or hydrophilic and what does this mean

Answer 4

hydrophobic - make the lipids insoluble in water

Question 5

2 types of fatty acids

Answer 5

saturated and unsaturated

Question 6

structure of saturated fatty acids

Answer 6

dont have double bonds between carbon atoms

Question 7

structure of unsaturated fatty acids

Answer 7

have double bonds between carbon atoms - cause chain to kink

Question 8

are triglycerides formed by condensation or hydrolysis

Answer 8

condensation

Question 9

which bond forms between the glycerol and fatty acid in the triglyceride

Answer 9

ester bond

Question 10

difference between phospholipids and triglycerides

Answer 10

one of the fatty acid tails has been replaced with a phosphate group

Question 11

in phospholipids, are the tails hydrophobic or hydrophilic

Answer 11

hydrophobic - repel water

Question 12

whats the test for lipids

Answer 12

emulsion

Question 13

3 steps for emulsion test

Answer 13

1. shake test substance with ethanol for a min, pour solution into water
2. any lipid will show up as a milky emulsion
3. the more lipids, more noticeable the milky colour