UPSC CSE Prelims
Question 26
Consider the following statements :
- No virus can survive in ocean waters.
- No virus can infect bacteria.
- No virus can change the cellular transcriptional activity in host cells.
How many of the statements given above are correct?
View correct answer and explanation
Correct answer: D
Correct Option: D (None)
Explanation: Viruses are abundant in marine ecosystems, bacteriophages infect bacteria, and many viruses modify host gene expression. Therefore, every sweeping 'no virus' assertion is false.
Statement / Pair / Item-wise Analysis:
I: False-marine viruses survive in oceans.
II: False-bacteriophages infect bacteria.
III: False-viruses can alter host transcription to support replication.
Option-wise Analysis:
A. Incorrect-'Only one' overstates the verified count of 0.
B. Incorrect-'Only two' overstates the verified count of 0.
C. Incorrect-'All the three' overstates the verified count of 0.
D. Correct-this matches the facts and the item-wise assessment above.