2 BM - Lipids

Question 1

What are the roles of lipids ((WIPE))

Answer 1

Waterproof
Insulation
Protection
Energy Source

Question 2

What are the 3 main types of lipids?

Answer 2

• Triglycerides
• Phospholipids
• Steroids

Question 3

What is the structure of a steroid?

Answer 3

4 fused rings

Question 4

What is the structure of a triglyceride?

Answer 4

3 fatty acids with a glycerol backbone

Question 5

What is the structure of phospholipids

Answer 5

2 fatty acids, glycerol and a phosphate group.

Question 6

What are the bonds between lipids called?

Answer 6

Ester bonds.

Question 7

What is a saturated fatty acid?

Answer 7

A fatty acid with no double carbon bonds.

Question 8

What is a unsaturated fatty acid?

Answer 8

A fatty acid with double carbon bonds (there can be multiple.)

Question 9

Triglyceride properties and structure.

Answer 9

• High ratio of energy storing Carbon - Hydrogen bonds, meaning its hydrolysed during respiration.
• Low mass to energy ratio, meaning that they are a good storage molecule for storage in low volumes as there is less mass to move around.
• Large and non-polar molecules meaning that they are insoluble in water and will not affect the water potential in cells.
• Have a high ratio of hydrogen - oxygen atoms, meaning water is released when they’re hydrolysed.