Roles of lipids

Question 1

What are the functions of lipids?

Answer 1

An energy source, insulation, protection, waterproofing, buoyancy and cell membranes.

Question 2

Insulation.

Answer 2

Fats are slow conductors of heat and so are often stored beneath the body surface in endothermic animals which help to retain body heat.

Question 3

Cell membranes

Answer 3

Phospholipids are important in cell membranes, contributing to their flexibility and the transfer of lipid soluble substances across them.

Question 4

Waterproofing

Answer 4

• waxy cuticles conserve water for terrestrial org.
• hydrophobic FA repel water so lipids are efficient at preventing water loss
• when oxidised, they provide more water than oxi.

Question 5

Buoyancy

Answer 5

Less dense than water. Aquatic birds and insects use oil droplets to aid buoyancy.