1.2

Question 1

Understand how a triglyceride is synthesised

Answer 1

formation of ester
bonds during condensation reactions between glycerol and three fatty acids.

Question 2

Know the differences between saturated and unsaturated lipids.

Answer 2

sat = C-C, solid at room temp, more compact as no kinks in chain - molecules packet close
unsat = C=C - lower IMP so lower MP so liquid at room temp

Question 3

roles of lipids 3

Answer 3

energy storage,
waterproofing and insulation

Question 4

Understand how the structure of lipids relates to their role in energy storage

Answer 4

v compact
lots of CH bonds broken during oxidation in resp so lots of ATP released
more CO bonds hydro;ysed - releases more energy
- have a low mass so can store more wo becoming too heavy

Question 5

Understand how the structure of lipids relates to their role in
waterproofing

Answer 5

fatty tail = hydrophobic - insoluble in water, dont affect water potential in cells

Question 6

Understand how the structure of lipids relates to their role in insulation.

Answer 6

conduct heat slowly - provide thermal insulation eg myelin sheath

Question 7

Understand how the structure and properties of phospholipids relate to their
function in cell membranes.

Answer 7

• phospholipids = 1 phosphate head, 2 fatty acids, 1 glycerol} when in water form bilayer in CSM
  polar due to charged phosphate
  bc head is hydrophilic and tail is hydrophobic
  head interacts w aq environment on both sides of membrane