living. It is, in fact, the most widespread biological entity on Earth.
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Viruses are unable to carry out any metabolic process independently: they contain only part of the genetic information necessary for their multiplication. Their nucleic acid - DNA or viral RNA - encodes only the structural proteins (which make up the lining of the virus) and some enzymes necessary for the replication of genetic material. All other functions (protein synthesis, energy production, etc.) are provided by the infected cell.
