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Lipids
Lipids
4.4
Lipids
Consists of elements:
carbon
,
hydrogen
and
oxygen
.
The ratio of element hydrogen is much higher compared to carbohydrates.
Fats and oils
Triglycerides
(3 fatty acids and 1 glycerol).
Each molecule of the fatty acid consists of a long hydrocarbon chain.
Fatty acids can be either
saturated
(single bond carbon atoms) or
unsaturated
(one or more double bond between carbon atoms).
Example of saturated fats: red meat, animal fats and butter.
Example of unsaturated fats: vegetable oils, olive oil and soybean oil.
Waxes
Long-chained molecules.
Waterproof.
Found on the cuticle of leaves and in the sebum.
Phospholipids
Main components of the plasma membrane.
Controls the permeability of the plasma membrane.
Consists of a hydrophilic head and hydrophobic tails.
Steroids
Raw material to synthesis vitamin, cholesterol and sex hormones.
Chapter : Chemical Composition in a Cell
Topic : Lipids
Form 4
Biology
View all notes for Biology Form 4
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