Lipids Flashcards
State 4 properties of lipids.
Energy store, insulation, protection and buoyancy.
What do lipids break down into?
Fatty acid chains and glycerol.
What does a fatty acid chain contain.
A hydrocarbon chain and a carboxyl group.
What is a carboxyl group?
C double bond O, OH.
O=C=OH
What difference is there between lipids and carbohydrates.
Lipids are insoluble in water.
How many carbons in a fatty acid chain in general?
15-17.
What is the structure of glycerol?
Three carbons vertically bonded. Bonded to H on the left and OH on the right. Also bonded to H at top and bottom.
How does the fatty acid and glycerol molecule join.
Through a condensation reaction when removing H2O.
What is created when a fatty acid joins to a glycerol molecule.
An ester bond.
What is created when 3 fatty acid chain join to a glycerol.
A triglyceride.
What is the molecular structure of the bond after the condensation reaction.
C-OOC-C
What does a saturated fatty acid have.
No double bond between carbon atoms.
What effect does a double bond have on the fatty acid chain?
Causes the chain to bend after the double bond.
What will the lipid tend to be if it contains double bonds.
Liquid for example oils as the fatty acid chains can’t be close together.
What is the test for lipids?
Add ethanol to sample. Shake. Add water. Cloudy if lipid is present.
