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GS Paper IUPSC Prelims 2021
Health & Medicine
Question No. 48Interactive Test Mode
00:00
+2-0.66

Q48. Consider the following statements: 1. Adenoviruses have single stranded DNA genomes whereas retroviruses have double-stranded DNA genomes. 2. Common cold is sometimes caused by an adenovirus whereas AIDS is caused by a retrovirus. Which of the statements given above is/are correct?

Consider the following statements:

  1. Adenoviruses have single stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.
  2. Common cold is sometimes caused by an adenovirus whereas AIDS is caused by a retrovirus. Which of the statements given above is/are correct?
Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2021 • Science and Technology

Correct Answer: Option (B) — 2 only

Concept & Option Breakdown

Standard Reference Verified

Statement 1 is incorrect: Adenoviruses possess double-stranded DNA (dsDNA) genomes, whereas retroviruses possess single-stranded RNA (ssRNA) genomes that convert to DNA inside the host via reverse transcriptase. Statement 2 is correct: Adenoviruses can cause respiratory illnesses including common cold symptoms, and HIV, which causes AIDS, is a retrovirus.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2021 (Q48)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — 2 only

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Frequently Asked Questions — UPSC Prelims 2021 Q48

What is the official answer for UPSC Prelims 2021 GS Paper I Question 48 (Science and Technology)?

The official UPSC answer key for this 2021 Science and Technology (Health & Medicine) question is Option (B): "2 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2021 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

To solve Health & Medicine questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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