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Viroids differ from viruses in that they

  • A.infect only bacteria
  • B.consist of naked RNA with no protein coat
  • C.have a double protein capsid surrounding the genome
  • D.contain both DNA and RNA

Answer: B

A viroid is a small circular RNA with no capsid and no protein-coding capacity of its own, relying entirely on host enzymes. They are agents of plant disease, so they belong to the eukaryotic infection story even though they are not viruses.

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