Lipids

Question 1

Lipids

Answer 1

Long term energy storage molecules that contain C, H, and O –> have more C-H bonds and less O-H bonds than carbs
- Hydrophobic, insoluble in water

Question 1

Functions

Answer 1

Long term energy storage, for building membranes & other cell parts, chemical signalling

Question 2

Fats

Answer 2

Most common lipid (stores 2x energy of carbs & proteins) –> animals convert excess carbs to fat droplets in adipose tissue

Question 3

Fats: Triglycerides

Answer 3

Most common fats in plants & animals
- Contain 3 fatty acids and 1 glycerol molecule
- Fatty acids can be saturated (all single-bonded carbons) or unsaturated (contains double bonds)
- Ester linkages

Question 4

Phospholipids

Answer 4

Composes cell membrane –> made up of 2 fatty acids, 1 phosphate, and 1 glycerol
- When added to water, form micelles (hydrophilic heads orient towards water, hydrophobic tails orient inwards towards each other)

Question 5

Sterols (Steroids)

Answer 5

Contain 4 fused hydrocarbon rings and several different functional groups –> act as chemical messengers

Question 6

Waxes

Answer 6

Contain long-chain fatty acids linked to alcohols or C-rings –> hydrophobic with firm, pliable consistency (ideal as waterproof coatings)