The definition of viruses differs among scientists because these entities can neither be classified as living organisms nor non living entities. A virus is often housed in a protein coat or protein envelope a protective covering which allows the virus to survive between hosts.
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A virus is a chain of nucleic acids dna or rna which lives in a host cell uses parts of the cellular machinery to reproduce and releases the replicated nucleic acid chains to infect more cells.
Virus definition biology. Viruses infect cells of microorganisms plants and animals and whilst they carry out no metabolism themselves they are able to control the metabolism of the infected cell. A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Virus nucleic acid is replicated and virus components are synthesized inside the cell.
In biology viruses are microscopic entities that are able to replicate inside the cell of its host. Viruses infect all types of life forms from animals and plants to microorganisms including bacteria and archaea. In infection the virus interacts with the host cell surface and penetrates the cell.
Viruses are infectious agents that replicate inside the body of a host.
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