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Preview of Lipids

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Mixed group of hydrophobic compounds made of Carbon, Hydrogen and Oxygen. Functions
include, insulation, energy storage, protection, waterproofing, cell membrane, production of
Glycerol and fatty acids combine via condensation to create triglycerides. R group of a fatty acid
can be saturated or unsaturated. In phospolipids there are only two fatty acid chains, rather than
three, and this is substituted by a phosphate group.
If there are no C=C double bonds in the hydrocarbon chain, then it is a saturated fatty acid
(i.e. saturated with hydrogen). These fatty acids form straight chains, and have a high
melting point. GOOD
If there are C=C double bonds in the hydrocarbon chain, then it is an unsaturated fatty
acid (i.e. unsaturated with hydrogen). These fatty acids form bent chains, and have a low
melting point. Fatty acids with more than one double bond are called poly-unsaturated fatty
acids (PUFAs). BAD
Glycerol Fatty Acids. Saturated= Fats, Unsaturated= Oils.
This is a condensation reaction, the new bonds are called ester bonds.

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Triglyceride are insoluble in water. They are used for storage, insulation and protection in
fatty tissue found under the skin or surrounding organs. They yield more energy per unit
mass than other compounds so are good for energy storage. Carbohydrates can be
mobilised more quickly, and glycogen is stored in muscles and liver for immediate energy
· Triglycerides containing saturated fatty acids have a high melting point and tend to
be found in warm-blooded animals. At room temperature they are solids (fats), e.g.…read more

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