Solve the question of and select the option from the choices A through D/E. Check your Answer and view the explanation.
Question: 2
Which one of the following statements is correct?
- Prions are the smallest free-living cells
- The cell wall of Mycoplasmas is made up of amino sugars
- Viroids consist of single-stranded RNA molecules
- Rickettsias lack cell wall
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Correct Answer: C
None
Sol. Viroids are the smallest infectious pathogens known. They are solely composed of a short strand of circular, single-stranded RNA without protein coat. ... The unique properties of viroids have been recognized by the International Committee for Virus Taxonomy with the creation of a new order of subviral agents.