Viruses Parasitism

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viruses obligate intracellular parasites, characterized extremely limited biological function, point where, while evidently able infect other organisms bacteria , archaea animals, plants , fungi, unclear whether can described living. viruses consist of strip of genetic material (dna or rna), covered in protein coat , lipid envelope. lack usual machinery of cell such enzymes, relying entirely on host cell s ability replicate dna , synthesise proteins. viruses bacteriophages, infecting bacteria, , possible viruses both extremely ancient, being @ least old first cells, , polyphyletic, having evolved several entirely unrelated ancestors.








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