STRUCTURES EXTERNAL TO THE CELL WALL

STRUCTURES EXTERNAL TO THE CELL WALL -...

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STRUCTURES EXTERNAL TO THE CELL WALL 1. GLYCOCALYX --this is a sticky mass that surrounds many prokaryocytes. It may be made of  polysaccharides or polypeptides. a. Capsule-glycocalyx that is organized and firmly attached to the cell wall. b. Slime layer-unorganized and loosely attached. c. Functions of glycocalyx 1) May protect bacteria from phagocytosis, making them more virulent (able to cause more  serious disease)— Bacillus anthracis, Streptococcus pneumoniae 2) May allow bacteria to attach to a surface--- Streptococcus mutans  on teeth 3) May serve as a source of nutrients and protect against dehydration 2. FLAGELLA -long filamentous (thread-like) appendages used by bacteria for movement a. Arrangement of flagella 1) Monotrichous--- 1 flagellum at one end 2) Amphitrichous- cluster of flagella at each end 3) Lophotrichous—2 or more flagella at one end 4) Peritrichous- over entire cell
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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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STRUCTURES EXTERNAL TO THE CELL WALL -...

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