Which of the following diseases is caused by a virus?
Correct answer: C. Poliomyelitis
- A. Cholera
- B. Tuberculosis
- C. Poliomyelitis
- D. Typhoid
Explanation
Polio is caused by the poliovirus, which attacks motor neurones and can cause paralysis. Cholera and typhoid are bacterial diseases of the gut and tuberculosis is caused by Mycobacterium, so only poliomyelitis in the list is viral.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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