B I O L O G Y 0 2 330-Dec-09Gardiner1Cell MembranesMembrane Function1.Be protective2.Regulate transport3.Signal transduction4.Cell recognition5.Provide anchoring sites6.Help compartmentalize7.Provide stable site for enzyme binding8.Regulate fusion via junctions9.All directed organelle motility
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•The proteins in the plasma membrane may provide a variety of major cell functions.Fig. 8.9B I O L O G Y 0 2 330-Dec-09Gardiner8Phospholipids•Phosphate group gives lipid a polar head–(hydrophilicwater loving)•Fatty acids are hydrophobic–(water-fearing)•In water phospholipids form a bilayer= membrane : polar group facing out, fatty acids in.Complex Lipidsphospholipids-phosphate group-glycerol-two fatty acidsHydrophilic headHydrophobic tailsFigure 5.4Phospholipid MembraneFig. 5.4Fig. 6.7