BioLect12.9-21 - Lecture 12 Membranes Transport Membrane...

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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 -
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