Problem 7, 135

Problem 7, 135 - (Explain c The conductance of a lipid...

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Problem 7 (Due Apr. 19) a) Explain the differences in the melting points of stearic (octadecanoic) acid (mp 69.6°C), trans -oleic (9-octadecenoic) acid (mp 44.5°C) and cis -oleic acid (mp 13.4°C). b) The membrane lipids from 4.74 × 10 9 erythrocytes form a monolayer of area 0.89 m 2 when spread on the surface of water. It has also been determined from ultrastructural studies that the surface area of a single erythrocyte is approximately 100 μm 2 . What do these data indicate about the structural motif characterizing the lipid components in the membrane?
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Unformatted text preview: (Explain) c) The conductance of a lipid bilayer membrane containing valinomycin in a medium containing potassium ions decreased abruptly when the temperature was lowered from 40°C to 36°C. In contrast, the change in conductance of the same membrane containing gramacidin was negligible when exposed to the same temperature drop in the same medium. Provide a brief explanation for these observations....
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This note was uploaded on 09/08/2010 for the course CHEM 135 at San Jose State.

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