Discussion
Which one of the following statements about exotoxins is false?
Answer: D
Correct answer: polysaccharide-lipid complex in nature
That statement is false: exotoxins are proteins. It is the endotoxin that is a lipopolysaccharide complex. The other three are true of exotoxins - their action is usually enzymatic, they have specific tissue affinities (tetanus toxin for nerve, cholera toxin for gut epithelium), and being catalytic they are active in minute amounts. Being protein, they are heat labile and can be converted into toxoids.
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