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Why are viruses considered a link between living and non-living?

Answer and explanation

Correct answer: Because they are non-living outside a host cell but reproduce inside it

Direct answer: B. A virus is an acellular particle containing genetic material, DNA or RNA, surrounded by a protein coat. Outside a suitable host cell it is inert: it has no independent cellular metabolism, cytoplasm, or cellular machinery for reproduction. Once it enters a living host cell, it uses the host's machinery to make copies of its genetic material and produce new virus particles. This ability to replicate in cells resembles life, while its inert state outside cells resembles non-living matter. A is wrong because viruses do not independently respire. C is wrong because small size alone does not define life. D is wrong because viruses are acellular and do not possess cytoplasm or a true cell wall. Memory cue: inert outside, replicating inside.

Related tags

VirusesAcellular OrganismsHost CellLiving And Non-LivingBiological ClassificationViroidsAnd PrionsViruses Viroids And PrionsBiology

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