Which of the following is correct for a virus?
Correct answer: D. All of these
- A. It is a non-cellular entity
- B. Obligate parasite
- C. Ultramicroscopic in size
- D. All of these
Explanation
Viruses are non-cellular particles made of genetic material surrounded by a protein coat, and they are usually ultramicroscopic. They cannot reproduce independently and must use the machinery of a living host cell, so they are obligate intracellular parasites. Students may select only option b because parasitism is the best-known feature, but all three statements describe viruses.
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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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