A) a nematode
B) a virus
C) a bacterium
D) a viroid
Correct Answer: D
Solution :
Viroids are small, circular, single-stranded UNA molecules that are the smallest known pathogens. A few well studied viroids include coconut cadang-cadang viroid, citrus exocortis viroid and potato spindle tuber viroidYou need to login to perform this action.
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