Homework Answers
1. Exotoxins (Exo means outside) are protein components secreted by bacterial cells in growth medium. These are produced by both gram positive as well as gram negative bacteria. These are of 3 types.
a. neurotoxin- affect nerve impulse. Botulin toxin produces by Clostrudium botulinum
b. cytotoxin- kill host cell. Diptheria toxin by Corynebacterium diphtheriae
c. enterotoxin-affects cells of gastro-intestinal tract. Shiga toxin by Shigella dysenteriae
2.Endotoxins are lipopolysaccarides present on outer membrane of gram negative bacteria. These are released when cell dies or broken down
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