First slide

Viruses, Viroids,Prions and Lichens

Question

Viroids

Easy

A

have protein coat same as found in viruses.
B

cause disease in animals only.
C

are abnormally folded proteins.
D

are smaller than viruses.

Solution

Viroids are infectious RNA particles that are smaller than viruses and cause potato spindle tuber disease. It lacks the protein coat that is found in viruses and hence the name viroid. The RNA of the viroid has low molecular weight.

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