_ are amongst smallest known virus.
Correct answer: B. Parvoviruses
- A. Picornavirus
- B. Parvoviruses
- C. Herpes virus
- D. Rotavirus
Explanation
Option B is correct since parvoviruses are the smallest icosahedral particles about 18-26 nm in diameter. Option A is incorrect since picornaviruses are larger than parvoviruses with a diameter of 22-30nm. Option C is incorrect since the herpesviral is a large family of double-stranded and DNA viruses that are larger than both parvoviruses and picornaviruses with a diameter of about 120-260nm. Option D is incorrect since rotaviruses are larger than both parvovirus and picornaviruses with a diameter of about 70 nm when a double-layered capsid is present and 55 nm when this capsid is absent.
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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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