• occur in membranes
• are the form in which
lipids are transported in
the blood e.g. fatty acids
are bound to albumin
Lipoproteins vary in size and
Terpenes may be:
volatile : attract pollinators
strongly bitter-tasting to prevent
plants being eaten by herbivores
Examples of terpenes:
in animals & plants
- traps light in plants and in humans
- is broken down into two vitamin A molecules
from which we make rhodopsin
Carotenoids also act
trap free radicals and inhibit oxidation
Question: [MAY, 2007]
Suggest explanations for the following statement.
Fats are used as storage molecules rather than as an
immediate energy source. (2)
Fats are ideal for storing energy as they release large
quantities of energy. This means that small quantities
of stored fat carried by the organism provide
sufficient energy without having to carry a heavy
Fat molecules are large and would take a long time to
release energy, making them unsuitable for
immediate sources of energy.
Question: [SEP, 2007]
Use your knowledge of biology to explain
the following. (5 marks)
Most animals use fats, rather than starch,
as energy-storage molecules.
No life as we know it can exist without lipids.
Comment on the importance of lipids to life.
Give an account of the important roles played
by lipids in living organisms. [SEP, 1998]
Give an overview of the importance of lipids
for living organisms.