Biology » Viruses » Other Acellular Entities: Prions and Viroids

Summarizing Other Acellular Entities: Prions and Viroids


Prions are infectious agents that consist of protein, but no DNA or RNA, and seem to produce their deadly effects by duplicating their shapes and accumulating in tissues. They are thought to contribute to several progressive brain disorders, including mad cow disease and Creutzfeldt-Jakob disease. Viroids are single-stranded RNA pathogens that infect plants. Their presence can have a severe impact on the agriculture industry.



agent with the ability to cause disease


infectious particle that consists of proteins that replicate without DNA or RNA


normal prion protein


infectious form of a prion protein


plant pathogen that produces only a single, specific RNA

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