320SummerHomework2_Answers - Cell Biology (BIO 320), Summer...

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Cell Biology (BIO 320), Summer 2008, Dr. Bushart Homework for quiz #2 1. Lectins are proteins that bind to carbohydrates. Where would you expect to find lectins closely associated with membranes? Why? Carbohydrates associated with membranes are specifically found on the outer face of the plasma membrane so lectins would bind at that region over any other. 2. Why must transmembrane proteins be amphipathic? Does the protein portion of a membrane-anchored protein have this restriction? Why or why not? A transmembrane protein has to have a hydrophobic region in order to cross the hydrophobic core of the membrane. However, either side of the membrane is exposed to water and lined by hydrophilic heads. Therefore, the parts of the proteins near those areas are going to have to be hydrophilic. A protein anchored into the membrane is not limited in this fashion. Since its hydrophobic interaction is in the anchor, the rest of the protein could potentially be hydrophilic.
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This note was uploaded on 08/31/2009 for the course BIO 320 taught by Professor Staff during the Summer '08 term at University of Texas.

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320SummerHomework2_Answers - Cell Biology (BIO 320), Summer...

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