cell bio hw 2 answers - Cell Biology (BIO 320), Spring...

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Cell Biology (BIO 320), Spring 2009, Dr. Bushart Homework 2 for exam preparation, no quiz 1. Lipid rafts are thicker than other regions of the membrane. Describe the fatty acid tails of the phospholipids that would make up a lipid raft (as compared to “regular” phospholipids). Would you expect the lipids within the raft to have more or less lateral mobility than the lipids in the other parts of the membrane? Explain. Since the lipid raft regions are thicker, the fatty acid tails of the phospholipids are likely to be longer and more saturated (straight rather than bent). This allows us to answer the second part of the question because straighter tails pack more tightly to their neighbors and long tails have a greater length of contact with their neighbors. Both of these facts would result in the lipids in the raft regions having less lateral mobility due to greater van der Waals forces. 2. Compare a lipid raft versus a regular membrane. Some transmembrane proteins can enter lipid rafts while others never do. What simple difference would you expect to find between single-pass transmembrane proteins that can enter a lipid raft versus those that physically cannot enter lipid rafts (this was basically the question asked during lecture 8)? Lipid rafts are thicker. In order to fit into a lipid raft then, the membrane-spanning
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This note was uploaded on 02/28/2009 for the course BIO 50120 taught by Professor Bushart during the Spring '09 term at University of Texas at Austin.

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cell bio hw 2 answers - Cell Biology (BIO 320), Spring...

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