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21. Principles of Disease
Exotoxins vs. Endotoxin Review
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The diphtheria toxin is secreted by Corynebacterium diphtheriae bacteria. This toxin has two components, one that binds the host cell and one that causes disease. Which of the following about the diphtheria toxin is false?
A
An endotoxin.
B
An exotoxin.
C
An A-B toxin.
D
A protein toxin.
E
Highly toxic.
F
Lethal in small doses.
Verified step by step guidance1
Understand the nature of diphtheria toxin: It is produced by Corynebacterium diphtheriae and is known for its potent effects on host cells.
Identify the characteristics of endotoxins: These are typically lipopolysaccharides found in the outer membrane of Gram-negative bacteria, not proteins.
Recognize the characteristics of exotoxins: These are proteins secreted by bacteria, often highly toxic and can be lethal in small doses.
Understand the A-B toxin structure: A-B toxins have two parts, where 'A' is the active component causing damage, and 'B' binds to the host cell.
Evaluate the options: Compare the characteristics of diphtheria toxin with the definitions of endotoxin, exotoxin, A-B toxin, protein toxin, and its toxicity level to identify the false statement.
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