Lipids

Question 1

List 5 roles of lipids

Answer 1

Waterproofing, insulation, protection, cell membranes and energy

Question 2

Describe the structure of a triglyceride

Answer 2

One molecule of glycerol bonded by and ester bond to 3 fatty acids with hydrocarbon tails.

Question 3

What gives triglycerides their different properties and how are these different?

Answer 3

Saturated no double bond and unsaturated have a double bond. Monounsaturated only one
Polyunsaturated more than one. Also cause a bend in the tail.

Question 4

Why are triglycerides a good source of energy?

Answer 4

High ratio of energy storing carbon to hydrogen bonds to carbon atoms.

Question 5

Describe the structure of a phospholipid

Answer 5

Has one molecule of glycerol and 2 fatty acids with a negatively charged phosphate group.

Question 6

What structure is formed by phospholipids in a cell membrane and how does it form?

Answer 6

A bilayer
The hydrophilic phosphate group points outwards and the hydrophobic fatty acid points inwards away from the water.