1.2 Biological Molecules: Lipids

Question 1

What is a triglyceride?

Answer 1

1 glycerol and 3 fatty acid tails

Question 2

What reactions form a triglyceride?

Answer 2

Condensation

Question 3

What bonds are found in triglycerides?

Answer 3

Ester

Question 4

What is an unsaturated triglyceride?

Answer 4

There are double carbon-carbon bonds present in fatty acids

Question 5

What is a saturated triglyceride?

Answer 5

There are no double carbon-carbon bonds present in fatty acids

Question 6

What test is done for the presence of a triglyceride?

Answer 6

Shake with ethanol and add water
Clear to milky white precipitate if fats are present

Question 7

What is a phospholipid?

Answer 7

Glycerol, 2 fatty acid tails and a phosphate

Question 8

How do phospholipids react in water?

Answer 8

Form micelles/bilayer

Question 9

What bonding is found in a phospholipid?

Answer 9

Ester

Question 10

What molecule do phospholipids contain that triglycerides do not?

Answer 10

Phosphate

Question 11

Are triglycerides hydrophilic or hydrophobic?

Answer 11

Hydrophobic

Question 12

Are phospholipids hydrophilic or hydrophobic?

Answer 12

Hydrophilic phosphate heads and hydrophobic fatty acid tails

Question 13

What are the similarities between phospholipids and triglycerides?

Answer 13

Can both be saturated/unsaturated
Both contain glycerol