Lipids that are saturated have two hydrogen atoms attatched to all carbon atoms
Lipids that are unsaturated have one or more carbon atoms double bonded, creating fewer hydrogen atoms attatched to the carbon backbone
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when there is no double bond between carbon atoms in fatty acid are called satruated fatty acid
general formula: CH3(CH2)COOH
one there is one or more double bond in carbon atoms in fatty acid are present they are called unsturated fatty acid
It is due to the double bonds in unsaturated fats, and the lack of these in saturated fats.
All natural dietary fats contain a mix of sat. and unsat. fats, but the greater the proportion of unsat. fat, the lower the melting point.
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Their structure, one has a straight line the other doesn't. Their function is quite different.