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UPSC 2002: Which one of the following statements is correct?
(a)Prions are the smallest free-living cells
(b)The cell wall of Mycoplasmas is made up of amino sugars
(c)Viroids consist of a single-stranded RNA molecule
(d)Rickettsia’s lack cell wall
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Not attemptedCorrect Answer: (c) Viroids consist of a single-stranded RNA molecule
Viroids are infectious agents made only of a short, circular, single-stranded RNA molecule, hence statement (c) is correct. Prions are solely proteinaceous particles and are not ‘cells’; Mycoplasmas completely lack a cell wall; Rickettsiae are Gram-negative bacteria that possess a peptidoglycan-containing wall. Therefore the other statements are incorrect. ([scribd.com](https://www.scribd.com/document/819879928/2002-QP-AW))
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Frequently Asked Questions
What is the correct answer to this UPSC 2002 Science & Technology question?▼
The correct answer is option (c): Viroids consist of a single-stranded RNA molecule. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Health & Diseases question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2002, GS Paper 1, as Question 134. It falls under Science & Technology > Health & Diseases.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Health & Diseases?▼
UPSC has asked 86 questions from Health & Diseases (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.