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Viruses Viron Virus Viral related Multi-particle virus Pro-virus Pseudo-virus Defective virus Sub-viruses Prion Satellite virus Viroid Virusoid **** Virus: a particle that has all discriminative features but lack the ability of replication. **** Virion: the viral particle in its replicated form **** Provirus is the integrated viral nucleic acid within the host nucleic acid **** It lack the ability of replication due to a functional disorder in some Viral genes through the replication of the slandered viruses **** Pseudo-virus: Similar to standard virus but its protein coat occupied by the host cell nucleic acid or organelle. **** Multi-particle: virus composed of two or more particles, each particle contain one viral genome segment. **** Satellite virus: That virus can not replicate except in the presence of another virus called helper. **** Virusoid: a satellite RNA particle which can not make infection but can replicate only inside the protein coat of other virus Viroid: Naked infectious closed circular single strand RNA with low molecular weight and potentially pathogenic agents to plants **** Prion: A group of proteinaceous infectious agent ( lacking nucleic acid) with high molecular weight and cause diseases to animals only. Thank You