Link between living and non-living organisms?
Correct answer: B. Virus
- A. Bacteria
- B. Virus
- C. Cyanobacteria
- D. Plants
Explanation
Viruses are considered a link between living and non-living matter because they show living activity only inside host cells, while outside cells they are inert and can be crystallised. Students may choose bacteria because bacteria are microscopic, but bacteria are complete cellular organisms and are always considered living.
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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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