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Which of the following statements is wrong for viroids?

1. They lack a protein coat
2. They are smaller than viruses
3. They cause infections
4. Their RNA is of high molecular weight

Correct answer: Their RNA is of high molecular weight

Solution

Viroids are infectious agents composed only of a very small circular RNA molecule and they do not have a protein coat. Therefore, saying their RNA is of high molecular weight is wrong because viroid RNA is actually very small.

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