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How are viroids different from viruses?...

How are viroids different from viruses?

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Viroids were discovered in 1917 by T.O. Denier. They cause potato spindle tuber disease. They are smaller in size than viruses. They also lack the protein coat and contain free RNA of low molecular weight.
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Viroids discovered by Diener (1971) are infectious agents and cause diseases in plants only. They differ from viruses in being