Which of the following causes plague?
Correct answer: C. Yersinia pestis
- A. Trichinella spiralis
- B. Salmonella typhimuium
- C. Yersinia pestis
- D. Leishmania donovani
Explanation
Plague is an acute epidemic disease of rats and other wild rodents caused by the bacterium Yersinia pestis. It is transmitted to humans by rat fleas. The symptoms include headache, fever, weakness, aching limbs, and delirium, followed by acute painful swellings of the lymph nodes. Bleeding under the skin, resulting in black patches, can lead to ulcers, which may prove fatal. Treatment with tetracycline, streptomycin, and chloramphenicol is effective.Trichinosis is caused by Trichinella spiralis, which lives as an endoparasite in the human intestine. Salmonella typhimurium causes enteric fevers, and Leishmania donovani is responsible for kalaazar.
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Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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