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30-07-2007, 23:44
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 How does water enter a membrane in osmosis? I know osmosis is the diffusion of water across a membrane. Lipids, which are nonpolar, are hydrophobic and do not dissolve in water. Since the plasma membrane is a phospholipid bilayer, only nonpolar substances can readily dissolve through the plasma membrane. Large polar molecules must travel across a membrane in special hydrophilic (protein) channels. Since water is a polar molecule, does this mean water travels across a membrane through special protein channels?
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