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Viroids, discovered by T.O. Diener in 1971, differ from viruses in lacking a:

ACell wall
BFlagellum
CProtein coat
DNucleic acid
Answer & Solution
Correct answer: C. Protein coat
1. They cause potato spindle tuber disease. 2. A viroid is free RNA without a protein coat. 3. Its RNA has low molecular weight. _Source: syllabus Biology, Chapter 2, Biological Classification._
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