Lecture4.2010 - 1 BIO 320 CELL BIOLOGY READING: Alberts...

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1 BIO 320 – CELL BIOLOGY READING: Alberts Chapter 10 Lecture 4: The Structure and Function of the Membranes 1/28/10 I. Introduction A. The plasma membrane is the outer boundary of the cell. B. Plasma membranes of all cell types exhibit characteristic trilaminar appearance in electron micrographs. II. An Overview of Membrane Functions a. Protective Physical Barrier b. Selective Chemical Barrier c. Encapsulates Specialized Compartments d. Support Two Dimensional Diffusion III. The Chemical Composition of Membranes A. Membrane composition: 1. The lipid and protein components of membranes are bound together by non-covalent forces. 2. In addition to lipids and proteins, membranes also contain carbohydrates.  1. Protein/lipid ratios vary considerably among different membrane types.  B. Membrane lipids: 1. Membrane lipids are amphipathic. 2. There are three main types of membrane lipids: a. Phospholipids (most are Phosphoglycerides) are diacylglycerides with small functional head  groups linked to the glycerol backbone by phosphate ester bonds.  b. Sphingolipids are ceramides formed by the attachment of sphingosine to fatty acids. c. Glycolipids have a carbohydrate attached to the lipid.   d Cholesterol is a smaller and less amphipathic lipid that is only found in animals. C.
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This note was uploaded on 04/12/2010 for the course PSY 339 taught by Professor Neal during the Spring '09 term at University of Texas at Austin.

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Lecture4.2010 - 1 BIO 320 CELL BIOLOGY READING: Alberts...

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