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UPSC PYQPrelims 2025

Civil Services Examination · Question 9

Consider the following statements: I. No virus can survive in ocean waters. II. No virus can infect bacteria. III. No virus can change the cellular transcriptional activity in host cells. How many of the statements given above are correct?

  1. Only one
  2. Only two
  3. All the three
  4. None
Show answer & explanation

Answer: (D) None

Explanation

All three statements are false: viruses thrive in oceans, bacteriophages infect bacteria, and many viruses alter host transcription.