Viruses 
depend on the host cell that they infect to produce, found outside of host cells, viruses exist as a protein coat or capsid sometimes enclosed within a membrane. A virus can insert its genetic material into its host taking over the host functions.
depend on the host cell that they infect to produce, found outside of host cells, viruses exist as a protein coat or capsid sometimes enclosed within a membrane. A virus can insert its genetic material into its host taking over the host functions.
Prions a disease causing agent that is neither bacterial nor fungal nor viral and contains no 
genetic material. Prions are responsable for number of degenerative brian diseases.
genetic material. Prions are responsable for number of degenerative brian diseases.Viroids small agents of infectious disease, acellular, identified as an infectious agent in plants.
(Viroids and Prions do not have protein capsids protecting their nucleic acid)
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