Why are viroids resistant to nucleases?
A) Having a circular RNA "genome," they are resistant to the digestion of most exonucleases (that nibble/digest the free ends of RNA or DNA) .
B) Having a circular RNA "genome," with no protein shell,they are resistant to the protein-degrading activities of nucleases.
C) Nucleases will only digest DNA,not RNA-so viroids are protected.
D) Viroids have only been identified in plants.Plant nucleases cannot digest RNA.
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