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Unformatted text preview: Membranes are Differentially Permeable The plasma membrane is differentially permeable because some particles can pass through, others cannot. It can control the extent to which certain substances pass through. Nonpolar molecules pass through cell membranes more readily than polar molecules because the center of the lipid bilayer (the fatty acid tails) is nonpolar and does not readily interact with polar molecules. The following substances can pass through the cell membrane: Nonpolar molecules (example: lipids) Small polar molecules such as water The following substances cannot pass through the cell membrane: Ions and charged molecules (example: salts dissolved in water) Large polar molecules (example: glucose) Macromolecules...
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.
- Fall '10