Lipids

Question 1

Lipids

Answer 1

• contains carbon, hydrogen and oxygen
• non-polar compounds
• insoluble in water
• can dissolve in organic solvents, e.g. alcohols

Question 2

Properties of lipids (single C-C bond)

Answer 2

• the fatty acid is saturated
• carbons atoms are linked to maximum
  number of hydrogen atoms
• saturated with hydrogen atoms
• molecules can align readily, fats are solid
• remain semi-solid at body temp.
• storage in mammals

Question 3

Properties of lipids (double C-C bonds)

Answer 3

• molecule is unsaturated, chain has a kink.
• molecules cannot align uniformly
• lipids cannot solidify readily
  - unsaturated lipids are oils,
  - remain liquid at room temp.
• one double C-C bond molecule is mono-unsaturated
• many double C-C bonds, molecule is
  polyunsaturated.

Question 4

Waxes

Answer 4

waterproofing in terrestrial organisms and reduce water loss