Viruses are considered living organisms because__________?
Correct answer: D. They contain DNA and can be reproduced
- A. They can be crystallized
- B. They occur in plants and animals
- C. They are microscopic
- D. They contain DNA and can be reproduced
Explanation
Viruses contain genetic material, either DNA or RNA, and can make new virus particles inside a suitable living host cell. Crystallization, microscopic size, and occurrence in plants and animals do not prove that something is living. Students most often choose option a because they confuse the ability to crystallize with a characteristic of life, although crystallization is evidence of viruses' non-cellular nature.
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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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