Question

what are prion and viroids

Answer 1

The most well-known disease caused by prions is mad cow disease. Ingram Publishing/ThinkStock. A viroid (an infectious RNA molecule) is similar to a virus but not quite the same thing. It's smaller than a virus and has no capsid. A viroid is a coiled, "naked" RNA molecule that can affect a cell.
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Answer 2

Viroids are infectious agents composed exclusively of a single piece of circular single stranded RNA which has some double-stranded regions. Because of their simplified structures both prions and viroids are sometimes called subviral particles.