Discussion
Match the entries in Group I with that in Group II.
| Group I | Group II |
|---|---|
| P) Cholera toxin | 1) Endotoxin |
| Q) Diphtheria toxin | 2) Neurotoxin |
| R) Lipopolysaccharide | 3) Enterotoxin |
| S) Tetanus toxin | 4) Cytotoxin |
Answer: C
The correct match is P-3, Q-4, R-1, S-2.
- Cholera toxin acts on the intestine, causing fluid loss: an enterotoxin.
- Diphtheria toxin kills cells by blocking protein synthesis (it inactivates elongation factor 2): a cytotoxin.
- Lipopolysaccharide is part of the Gram-negative outer membrane and is the classic endotoxin.
- Tetanus toxin blocks inhibitory neurotransmitter release: a neurotoxin.
P-3, Q-2, R-1, S-4 swaps diphtheria and tetanus toxins. The other two options match lipopolysaccharide wrongly; it is the endotoxin.
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