ProblemSet6 - automatically reseal. What properties of...

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Chem114A, 2006 Practice Problem Set6 1. Describe what is the fluid mosaic model. 2. Is fluid mosaic model temperature dependent? 3. Explain why an erythrocyte membrane that synthesizes too little spectrin is a sphere rather than a biconcave disk. 4. What is the common structural feature of membrane lipid molecules? For each of the following membrane lipids, name the components that serve as the hydrophobic and phydrophilic units: (a) sphingomyelin (b) ganglioside (c) cholesterol 5. Cell membranes are self-sealing if they are punctured or disrupted mechanically, they quickly and
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Unformatted text preview: automatically reseal. What properties of membranes are responsible for this important feature? 6. At pH 7, tryptophan crosses a lipid bilayer membrane about 1,000 times more slowly than does the closely related substance indole. Suggest an explaination for this observation. 7. What are the enzymes which synthesize membrane lipids in eukaryotes and prokaryotes? How did Kennedy and Rothman demonstrate that newly synthesized bacterial cell membrane phospholipids rapidly cross from the cytoplasmic side to the external side of the membrane?...
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This note was uploaded on 01/31/2010 for the course CHEM chem 114A taught by Professor Gourisankarghosh during the Fall '06 term at UCSD.

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