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Lipids in Living Organisms
· Lipids make up 5% of organic matter in a cell.
· Solid lipid = fat , Liquid lipid = oil
· They are used for:
· A source of energy
· Energy storage ­ stored in adipose cell
· Biological membranes
· Insulation
· Protection
· Some hormones
· Lipids contain the elements carbon, hydrogen and
· Lipids are insoluble in water…read more

Slide 3

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· Glycerol is found
in all fats and oils
· The Glycerol
molecule is
always the same
· It is a 3 carbon
molecule with 3
OH groups…read more

Slide 4

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Fatty Acids
· All fatty acids have an acid
group at one end.
· The rest of the molecule is a
hydrocarbon chain, which can
be from 1 carbon to 20.
· These hydrocarbon chains
can be saturated,
monounsaturated or
· Unsaturated is when there are
Saturated one (mono) or many (poly)
C=C bonds.
· The C=C makes the
molecules in the lipid push
apart so they are more fluid
so oils are generally
Unsaturated unsaturated fats…read more

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· It consists of one glycerol molecule bonded to 3 fatty
· Triglycerides are insoluble in water so they are
· This is because they cannot form hydrogen bonds with
the water.…read more

Slide 6

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Forming Triglycerides
· A condensation
reaction takes
place between the
acid group of the
fatty acid and the
OH of the glycerol
to form a covalent
· The bond formed is
called an Ester
Bond…read more

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