| 1. | ANSWER : First, there were bacteria, then viruses and viroids.
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| 2. | This viroid is now called Potato spindle tuber viroid, abbreviated PSTVd.
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| 3. | This viroid is now called Potato spindle tuber viroid, abbreviated PSTVd.
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| 4. | Excluded are other ranks of virus, viroids and prions.
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| 5. | Vertical transmission of peach latent mosaic viroid through seeds can not occur.
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| 6. | The mode of natural inoculation of the viroid is unknown.
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| 7. | Viroids, which cause some plant diseases, are naked snippets of RNA.
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| 8. | Agents of this virus resemble that of plant viroids.
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| 9. | RNA polymerase II catalyzes rolling-circle synthesis of new viroids . ]]
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| 10. | Virusoids are essentially viroids that have been encapsidated by a helper virus coat protein.
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