Viroids differ from viruses in that viroids
Correct answer: A. consist only of short circular RNA with no protein coat
- 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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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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