Q.

What distinguishes viroids from viruses?

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a

Viroids have a protein coat, while viruses do not.

b

Viroids are larger than viruses and cause diseases in animals.

c

Viroids are made up of low molecular weight free RNA molecules. Unlike viruses, viroids are devoid of a protein coat.

d

Viroids and viruses both have high molecular weight RNA.

answer is C.

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Detailed Solution

Viroids, discovered by O. Dioner, are made up of a low molecular weight naked RNA molecule. They cause diseases in plants, ex: Potato spindle tuber disease. They have no protein coat around their genetic material.

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