Lipids

Question 1

Structure of triglyceride

Answer 1

• One molecule of glycerol
• 3 fatty acids attached

Question 2

Saturated fatty acids

Answer 2

No double bonds between atoms

Question 3

Unsaturated fatty acids

Answer 3

At least one double bond between carbons

Question 4

Triglyceride function

Answer 4

Long hydrocarbon tail - contains a lot of energy
Insoluble - so don’t cause water to enter the cells by osmosis
Bundle up together as insoluble droplets enter the cells as tails are hydrophobic ( water repel) tails face inwards

Question 5

phospholipid function

Answer 5

Found in a cell membrane known as a phospholipid bilayer
Phospholipid heads are hydrophilic , tails are hydrophobic
Centre of the bilayer is hydrophobic - water-soluble can’t easily pass through the membrane acts a barrier.

Question 6

Chlorestal

Answer 6

In eukaryotes help regulate the fluidity of the cell membrane of the cell membrane by interacting with phospholipid bilayer
Has a small size flattened shape - allows cholesterol to fit in between phospholipid molecules
At high temperatures bind to hydrophobic tails of the phospholipid - causing them to pack more closely together. Helps the membrane less fluid and more rigid.

Question 7

Ester bond