9.6: Subviral Entities Last updated Jan 3, 2021 Save as PDF 9.5E: Plant Virus Life Cycles 9.6A: Defective Viruses Page ID8684 BoundlessBoundless ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy9.6A: Defective VirusesReplication defective viruses (also known as satellites) are those that need the presence of other viruses to help them reproduce.9.6B: ViroidsViroids are plant pathogens without the protein coat that is typical for viruses.9.6C: PrionsPrions are infectious agents composed of protein in a misfolded form, unlike all other known infectious agents which contain nucleic acids.