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					 Cell recognition and adhesion occur due to biochemicals of cell membranes named
 
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- proteins
 - lipids
 - proteins and lipids
 - glycoproteins and glycolipids
 
 
Correct Option: D
Cell recognition and adhesion occurs due to biochemicals named glycoproteins and glycolipids of cell membranes. These are formed due to the small carbohydrate molecules present on lipids and extrinsic protein.