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Viroids

Potato spindl...

Question

Potato spindle tuber disease is caused by an organism which has:

A

RNA with protein coat

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B

Low molecular weight free RNA

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C

Abnormally folded protein

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D

Crystalline structure

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Solution

The correct option is B Low molecular weight free RNA
Potato spindle tuber disease is caused by an infectious agent called viroid. Viroids comprise free RNA of low molecular weight. They lack a protein coat that is found in viruses . Viruses are crystalline structures as they have a nucleic acid enclosed with a protein coat. Abnormally folded proteins are prions.

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(ii)

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