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?
- A.Only one
- B.Only two
- C.All the three
- D.None
▶ Answer & Explanation
Correct answer: D. None
Viruses are ubiquitous and can be found in various environments, including ocean waters where they play significant roles in marine ecosystems, such as regulating bacterial populations. Bacteriophages are viruses that specifically infect bacteria, demonstrating that viruses can indeed infect these microorganisms. Furthermore, viruses are known obligate intracellular parasites; upon infecting a host cell, they hijack the host's cellular machinery, including its transcriptional and translational processes, to replicate themselves, thereby altering cellular activity.
Source: UPSC gs1 2025