STRUCTURAL PROPERTIES OF CELL MEMBRANES

STRUCTURAL PROPERTIES OF CELL MEMBRANES - Fig. 2 )...

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STRUCTURAL PROPERTIES OF CELL MEMBRANES Formation of cell membranes is based upon the properties of lipids. All are bi-layers of phospholipids with associated proteins. As previously mentioned, phospholipids are amphipathic meaning that they possess both a hydrophobic and hydrophilic end ( Fig. 2 ). Polar head groups are in contact with water while fatty acid tails aggregate in the interior of the membrane. The four major phospholipids found in cell membranes: phosphatidyl choline ( Fig. 2 ) phosphatidyl ethanolamine (
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Unformatted text preview: Fig. 2 ) phosphatidyl serine ( Fig. 2 ) sphingomyelin - a non-glycerol phospholipid ( Fig. 3 ) Various glycolipids are also found in the outer leaflet of the cell membrane. Cholesterol is another important constituent of the animal cell membrane ( Fig. 4 ) . Lipid composition differs in the different types of cells and in different types of organisms. The average eukaryotic plasma membrane - ~50% of mass is lipid and 50% protein. The lipid bilayer behaves as a fluid....
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