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UPSC 2021: Consider the following statements: 1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes. 2. Common cold is sometime caused by an adenovirus whereas AIDS is caused by a retrovirus. Which of the statements given above is/are correct?
(a)1 only
(b)2 only
(c)Both 1 and 2
(d)Neither 1 nor 2
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Not attemptedCorrect Answer: (b) 2 only
Adenoviruses possess linear double-stranded DNA genomes, not single-stranded DNA, while retroviruses (e.g., HIV) carry two copies of positive-sense single-stranded RNA that is reverse-transcribed after infection; thus Statement 1 is wrong ([en.wikipedia.org](https://en.wikipedia.org/wiki/Adenovirus_genome)). Adenoviruses are well-known respiratory pathogens that can cause common-cold-like illness, whereas AIDS is caused by the retrovirus HIV, so Statement 2 is correct ([cdc.gov](https://www.cdc.gov/adenovirus/index.html?utm_source=openai)).
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Frequently Asked Questions
What is the correct answer to this UPSC 2021 Science & Technology question?▼
The correct answer is option (b): 2 only. 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 2021, GS Paper 1, as Question 70. It falls under Science & Technology > Health & Diseases.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
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.