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Answer: 4. Their RNA is of high molecular weight

Key idea: Viroids are infectious agents made only of a small, free RNA with no protein coat.

  • They lack a protein coat: true.
  • They are smaller than viruses: true.
  • They cause infections (e.g. potato spindle tuber disease): true.
  • Their RNA is of low molecular weight, not high. So statement (4) is wrong.
Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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