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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