Lec4.2010 - 1 BIO 320 CELL BIOLOGY READING: Alberts Chapter...

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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 Outline for the Reading 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
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Lec4.2010 - 1 BIO 320 CELL BIOLOGY READING: Alberts Chapter...

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