Why features of viruses are considered in characterizing the organismic standard of living.

A virus is a parasite that multiplies in a host cell. Some viruses multiply in their nucleus, others in the cytoplasm, and others in the nucleus and in the cytoplasm. When a virus in a host cell reproduces its own kind, it is an organism. So the virus is a form of life of the body. The structure of the virus, represented by its interacting main parts (nucleic acid and proteins), structural certainty (core and protein coat – capsid), its maintenance of its structure make it possible to consider the virus as a special living system – an organism-level biosystem.

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