L3 Outline - BIO 320 CELL BIOLOGY Summer 2009 A De Lozanne...

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BIO 320 - CELL BIOLOGY – Summer 2009 A. De Lozanne Lecture 3: The Structure and Function of Membranes Reading: Alberts, 5th Ed. Chapter 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.  Plants and  Fungi have other similar sterols. C. The Nature and Importance of the Lipid Bilayer:
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This note was uploaded on 07/22/2009 for the course BIO 89545 taught by Professor De lozanne during the Spring '09 term at University of Texas.

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L3 Outline - BIO 320 CELL BIOLOGY Summer 2009 A De Lozanne...

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