BIOLOGICAL MOLECULES (Lipids)
Lipids (Classes, Physical and Chemical Properties, grouping)
Fact!
functions of lipids.
(i) As an energy store
§One gram of fat contains twice the amount of energy as one gram of carbohydrates
§Storing of fat reduces space and weight compared to stroring carbohydrate of the same amount of energy
(ii) Formation of cell membrane
§Phospholipids are components of cell membrane
§Cholesterol regulate fluidity of cell membrane
(iii) As heat insulator
§Adipose/ fat tissues found under the skin can act as heatinsulator
(iv) To protect internal organs
§Fat tissues surround internal organs provide support and mechanical protection
(v) As a waterproof substance
§for example in the form of wax
(vi)As a precursor of other steroids as all steroids are synthesised from cholesterols
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