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Q.

Which of the following statements is wrong for viroids?

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a

Their RNA is of high molecular weight

b

They lack a protein coat.

c

They are smaller than viruses.

d

They cause infections.

answer is B.

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Detailed Solution

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The RNA of viroids have low molecular weight. In 1971, T.O. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. It was found to be a free RNA; it lacked the protein coat that is found in viruses, hence the name viroid. The RNA of the viroid was of low molecular weight.

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