The size of most viruses lies in the range
Correct answer: A. 20 to 300 nm
- A. 20 to 300 nm
- B. 20 to 300 um
- C. 1 to 10 mm
- D. 0.5 to 5 um
Explanation
Viruses are measured in nanometres, from about 20 nm for the smallest to roughly 300 nm for the largest such as poxviruses, which is why they pass through filters that hold back bacteria and are visible only under an electron microscope. The range 0.5 to 5 um is the size of typical bacteria, about a thousand times larger by volume.
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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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