3.1.3 - LIPIDS Flashcards
the general structure of a fatty acid is RCOOH. name the group represented by COOH (1)
carboxyl group
describe how you would test for the presence of a lipid in a liquid sample of food (2)
- add ethanol/alcohol then add water and shake/mix
- white/milky emulsion
describe how a triglyceride molecule is formed (3)
- one glycerol and three fatty acids
- condensation reactions and removal of three molecules of water
- ester bonds formed
describe how an ester bond is formed in a phospholipid molecule (2)
- condensation reaction
- between glycerol and fatty acid
describe how you would test a piece of food for the presence of lipid (2)
- dissolve the sample in alcohol, then add water
- white/milky emulsion
name the type of bond between a glycerol and fatty acid (1)
ester bond
a triglyceride is formed by condensation. from how many molecules is this triglyceride formed from? (1)
4
the structure of a phospholipid molecule is different from that of a triglyceride. describe how a phospholipid is different. (2)
- addition of a phosphate group
- instead of one of the fatty acids
omega-3 fatty acids are unsaturated. what is an unsaturated fatty acid? (2)
when double bonds are present between carbon atoms