NEET 2020 · BiologyViroids lichensPrevious Year Question
Which of the following is correct about viroids?
Answer: (D) They have free RNA without protein coat. Answer: (D) They have free RNA without protein coat Solution: Viroids (discovered by T.O.
- A.They have DNA with protein coat
- B.They have free DNA without protein coat
- C.They have RNA with protein coat
- D.They have free RNA without protein coat✓
Correct Answer
(D) They have free RNA without protein coat
Solution & Explanation
Answer: (D) They have free RNA without protein coat Solution: Viroids (discovered by T.O. Diener, 1971) are free RNA of low molecular weight that lack the protein coat found in viruses, which is the very reason for the name 'viroid'. Hence free RNA without protein coat is correct. NCERT Reference: NCERT Class XI, Biological Classification, p.21, lines 28-30 — "found to be a free RNA; it lacked the protein coat"
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