Answer:
A virus is a small infectious agent that only spreads via infecting the cells of animals, plants, and bacteria.
Viruses occupy a special position in taxonomy. They are neither plants, nor animals, nor prokaryotic bacteria, and they have their own kingdom. In fact, viruses should not be considered an organism because they are not free-living, meaning that they cannot reproduce or carry on metabolic processes without a host cell.
Viruses are quintessential parasites. They depend on the host cell for almost all of their life-sustaining functions. Unlike true organisms, viruses cannot produce proteins, since they lack ribosomes for the translation of viral messenger RNA into proteins.
Viruses are also energy parasites. Unlike cells, they cannot generate or store energy. The virus derives energy and other metabolic functions from the host cell.
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