Naked infectious RNA molecules that lack a protein coat and cause diseases of plants are called
Correct answer: C. viroids
- A. prions
- B. bacteriophages
- C. viroids
- D. capsomeres
Explanation
Viroids are short circular RNA molecules with no capsid at all, and they cause plant diseases such as potato spindle tuber disease. The word prion is the tempting confusion because both are sub viral agents, but a prion is the opposite case: infectious protein with no nucleic acid. A bacteriophage is a complete virus with a capsid and a tail.
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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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