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Unformatted text preview: Lecture 12 September 21, 2009 Membranes, Transport Membrane Structure and function- Phospholipid bilayer with integral/ peripheral proteins (carbohydrates)- Membranes are dynamic fluid mosaic model- Selective permeability control transport into and out of the cell Membrane Transport of Water/Solutes 1. Diffusion passive transport of solute molecules from areas of high concentration to low concentration 2. Osmosis diffusion of water across a selectively permeable membrane Water Transport/Balance in Cells compare bathing solution vs. cell- Hypotonic bathing solution (hypertonic cell solution) o Water moves into cell o Not good for animal cells o Good for plant cells (turgor)- Isotonic Solutions o No net water movement o Healthy situation for animal cell o Not healthy for plant cells- Hypertonic bathing solution (hypotonic cell solution) o Water moves out of the cell o Bad for animal and plant cells Solute Transport Across Membranes- Facilitated Diffusion passive transport of solutes across a membrane (down a concentration gradient) through proteins o Membrane-Transport Proteins...
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