Lipids

Question 1

How do you test for a Lipid?

Answer 1

Shake with ethanol, add water

white emulsion = positive test

Question 2

What is the name for the bonds in lipids?

Answer 2

Ester

Question 3

What type of reaction occurs to form the bonds?

Answer 3

Condensation

Question 4

What are the tails made from?

Answer 4

Hydrocarbon chains

Question 5

Explain what a saturated fatty acid is

Answer 5

no double carbon bonds

carbon atoms saturated with hydrogen

Question 6

Explain what an unsaturated fatty acid is

Answer 6

at least one double bond

Resulting in a kink in the tail

Question 7

Give the properties of a saturated fat

Answer 7

solid at room temperature

Question 8

Give properties of an unsaturated fat

Answer 8

liquid at room temperature

Question 9

Which part of a phospholipid is hydrophobic + hydrophilic

Answer 9

Hydrophobic - fatty acid tail

Hydrophilic - phosphate group

Question 10

Explain how triglycerides form droplets in water

Answer 10

Hydrophobic tails all face inwards

Question 11

Explain how phospholipids for a bilayer in water

Answer 11

Hydrophilic heads face out with hydrophobic tails facing in