lecture 5- membranes - OBJECTIVES: Explain why lipids form...

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OBJECTIVES: Explain why lipids form lipid bilayers Describe the characteristics of the bilayer Explain how different molecules move across the membrane Describe the difference between passive and active transport across the membrane
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III. Membranes A. Membrane structure (will form H bonds w/ water ) What happens when put lipids in water? (remember phospholipids are amphipathic) (won’t form H bonds w/ water ) 1. spheres (short tails) bilayer (longer tails) 2. Is the structure impt? (i.e. Are membranes impt?) -create a “new” environment -control internal environment
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A. Membrane Structure 3. Phospholipids can move in layer - not able to switch sides of membrane 4. Permeability related to: - Cholesterol presence - Hydrocarbon tail saturation - Temperature Saturated= has all electrons possible
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1. Movement of molecules -molecules are always in random motion (thermal E) - solutes = dissolved molecules or ions (e.g. dye) -movement from high conc. (e.g. left) to
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This note was uploaded on 11/20/2011 for the course BIOLOGY 101 taught by Professor Freeman during the Fall '11 term at Gustavus Adolphus College.

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lecture 5- membranes - OBJECTIVES: Explain why lipids form...

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