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Unformatted text preview: partition into a lipid bilayer) transport proteins facilitate the regulation of the osmotic balance within a cell, since ions cannot diffuse readily across the lipid bilayer of a membrane cells must maintain osmotic balance and electrical neutrality despite large differences in solute concentrations across cell membranes ions and hydrophobic molecules have low permeabilities need to be transported across somehow o Membrane transport proteins fall into two classes: carriers and channels very large and diverse protein familylarge number of transporters lots of molecules need to be transported (sugars, amino acids, nucleotides, ions, atp, protons) differ from membrane to membrane according to membrane function...
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- Spring '08
- cell biology