Question

short note on viroids and prions

Answer 1

Viroids are plant pathogens that consist of a very short stretch of circular, single-stranded RNA that does not have a protein coat. They are essentially strands of naked RNA. They are much smaller than viruses. Prions are protein particles that can cause other proteins to form abnormal shapes, which causes disease

Answer 2

Viroids discovered by T.O.Diener (1971) -free RNA -without protein caspid. RNA have low molecular weight , smaller than viruses , causes disease Potato spindle tuber.
Prions: An abnormal form of a normally harmless protein found in the brain that is responsible for a variety of fatal neurodegenerative disease of animals , including humans called Transmissible spongiform encephalopathies.