Viroids differ from viruses in that viroids
- A. consist only of short circular RNA with no protein coat
- B. contain DNA genomes
- C. are larger than any virus
- D. infect only animals
Explanation
Viroids are the smallest known infectious agents, naked circles of RNA that cause plant diseases such as potato spindle tuber. Viruses at least carry a protein capsid, so viroids are simpler still.
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