The size of smallest virus is______________?
Correct answer: B. 20 nm
- A. 10 nm
- B. 20 nm
- C. 30 nm
- D. 40 nm
Explanation
The smallest commonly cited viruses, such as parvoviruses, are approximately 20 nm in diameter. Their very small size reflects their simple structure and dependence on host cells for replication. Students may choose a because some measurements approach 10 nm, but 20 nm is the standard value used in this classification.
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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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