Which of the following diseases is NOT caused by bacteria?
Correct answer: B. small pox
- A. tetanus
- B. small pox
- C. tuberculosis
- D. diptheria
Explanation
Smallpox is caused by a virus, the variola virus, not a bacterium. Tetanus is caused by a bacterium called Clostridium tetani. Tuberculosis is caused by a bacterium called Mycobacterium tuberculosis. Diphtheria is caused by strains of bacteria called Corynebacterium diphtheriae.
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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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