_ are among the smallest known viruses.
Correct answer: B. Parvoviruses
- A. Picornavirus
- B. Parvoviruses
- C. Herpes virus
- D. Rota virus
Explanation
The smallest known virus, according to PTB, is the polio virus. Since this is not in the options, the closest answer is parvovirus because it has been implied in the following lines of PTB: Viruses are extremely small infectious agents that can only be seen under an electron microscope.They range in size from 250 nanometers (nm) for parvoviruses to 20 nm for parvoviruses.
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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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