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(a) Why are viruses regarded as biologic...

(a) Why are viruses regarded as biological systems as well as non-living particles? Give one reason each.

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(i) Viruses are regarded as biological system because they contain molecular information in the form of nucleic acid (either DNA or RNA), transcribed and replicated within the host cells.
(ii) Viruses are regarded as non-living particles because none of them has enzyme activity away from its host.
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