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Worksheet+1+-+Answer+Key - Lecture 2: Membrane Structure...

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Lecture 2: Membrane Structure Properties of Plasma Membrane Thin bilayer, surrounds all cells Composed of: o Lipids : main fabric of membrane o Proteins : embedded in or associated with bilayer Integral Peripheral o Carbohydrates Only on extracellular surface Attached to proteins and lipids Membrane structure is fluid – held together by weak hydrophobic interactions Can drift laterally (frequently) and flipflop (rarely) Three factors influence membrane fluidity: 1. Saturation a. Saturated : straight tails – increased/decreased fluidity b. Unsaturated : kinked tails – increased /decreased fluidity 2. Temperature a. Increase in temperature – increased /decreased fluidity 3. Cholesterol a. Type of lipid, found in membrane of all animal cells b. Acts as temperature buffer c. At body temperature (37°C), increases/decreases fluidity d. At low temperature, increases /decreases fluidity Lecture 3: Membrane Function and Passive/Active Transport Hypo-, Hyper, and Isotonic Relations
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This note was uploaded on 12/13/2011 for the course BIOSCI 93 taught by Professor Staff during the Fall '11 term at UC Irvine.

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Worksheet+1+-+Answer+Key - Lecture 2: Membrane Structure...

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