Which of the following statements is true regarding viruses?
- AThey are ubiquitous and extremely small in size.
- BThey can pass through bacteria-proof filters.
- CThey are obligate parasites in living cells.
- DAll of the above $(A), (B),$ and $(C)$.
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$T. O.$ Diener discovered a new infectious agent that was smaller than viruses and has the following characteristics:
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$(ii)$ It has free $RNA$.
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Identify the infectious agent.
$(i)$ It causes potato spindle tuber disease.
$(ii)$ It has free $RNA$.
$(iii)$ The molecular weight of $RNA$ is low.
Identify the infectious agent.
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