Lipid
Definition:
An essential structural component of living cells, lipids are a class of oily organic compounds which are insoluble in water but soluble in fats and oils. The lipid class of molecules mainly consists of fats, oils and waxes.
Source: GreenFacts
More:
Important lipids include fatty acids (saturated and unsaturated). They are a component of phospholipids and fats :
- phospholipids, main component of biological membranes composed of glycerol phosphate backbone, fatty acid substituents, and hydrophobic headgroups
- sterols, cholesterol derived membrane components, (sex) hormones, and bile salts (intestinal detergents).
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