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Unformatted text preview: diffusion. • However, because membranes are selectively permeable, the interactions of the molecules with the membrane play a role in the diffusion rate. • Diffusion of molecules with limited permeability through the lipid bilayer may be assisted by transport proteins. 3. Osmosis is the passive transport of water • Differences in the relative concentration of dissolved materials in two solutions can lead to the movement of ions from one to the other. • The solution with the higher concentration of solutes is hypertonic . • The solution with the lower concentration of solutes is hypotonic . • These are comparative terms. • Tap water is hypertonic compared to distilled water but hypotonic when compared to seawater. • Solutions with equal solute concentrations are isotonic . • Imagine that two sugar solutions differing in concentration are separated by a membrane that will allow water through, but not sugar....
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This note was uploaded on 08/08/2009 for the course BIO 1406 taught by Professor Gomez during the Spring '09 term at Collin College.
- Spring '09