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Unformatted text preview: hydrophilic heads on the inner and outer surfaces of the membrane. This layering is termed a bilayer since an electron microscopic technique known as freeze-fracturing is able to split the bilayer. Phospholipids and glycolipids are important structural components of cell membranes. Phospholipids are modified so that a phosphate group (PO 4-) replaces one of the three fatty acids normally found on a lipid. The addition of this group makes a polar "head" and two nonpolar "tails"....
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