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CELL WALL Complex, semi-rigid structure that gives shape and protection to the cell. 1. Functions  a. Prevents cell from rupturing due to entrance of too much water. b. Helps give shape c. Point of anchorage for flagella d. May contribute to ability to cause disease e. Site of action for some antibiotics f. Chemical composition may be used in classification 2. Composition and Characteristics a. Eubacterial cell walls are mainly made of peptidoglycan, a substance found nowhere else in  nature. It is in the form of one macromolecule that surrounds the entire cell. It consists of  disaccharide units connected by polypeptides to form a lattice.  1) Gram-positive cell walls a) These consist of many layers of peptidoglycan, forming a thick, rigid structure. b) Also included are teichoic acids, which consist of an alcohol and phosphate. c) Exact structure of the teichoic acids varies among species. This is the part that often acts as an 
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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