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?

Correct Answer:

(d) None

Explanation of the Correct Answer:

None of the three statements are scientifically accurate. Let’s assess each:

• Statement I: No virus can survive in ocean waters
  • Incorrect. Oceans are teeming with viruses, especially bacteriophages (viruses that infect bacteria).
  • Studies show that millions of viruses exist per milliliter of ocean water, forming a key part of the marine microbial ecosystem.
• Statement II: No virus can infect bacteria
  • Incorrect. Bacteriophages are viruses that specifically infect and replicate inside bacteria.
  • This is a fundamental concept in microbiology and virology.
• Statement III: No virus can change the cellular transcriptional activity in host cells
  • Incorrect. Most viruses reprogram the host cell’s transcriptional machinery to:
    • Facilitate viral replication
    • Suppress immune responses
    • Promote cell survival or apoptosis depending on their lifecycle
  • For example, HIV, influenza, SARS-CoV-2, and HPV significantly alter host gene expression.

Why Other Options Are Incorrect:

• (a) Only one – Incorrect: All three statements are false.
• (b) Only two – Incorrect: All three are false.
• (c) All the three – Incorrect: None of the statements are correct.

Relevant Supplementary Information

Table: Evaluation of Statements

Related Concepts:

• Marine Viruses: Vital for biogeochemical cycles in oceans (e.g., nutrient recycling).
• Bacteriophages: Used in phage therapy as an alternative to antibiotics.
• Viral Reprogramming: Helps viruses evade immunity and maximize replication efficiency.
• Transcriptional Modulation: Some viruses can even cause oncogenic transformations (e.g., HPV and cervical cancer).

Current Relevance:

• Phage therapy is gaining attention due to antimicrobial resistance.
• Viral manipulation of host transcription is a major research area in understanding COVID-19 pathogenesis.
• Marine virology helps model climate impacts through viral influence on plankton populations and carbon flux.

Table: Key Concepts Related to Virus Survival, Host Range, and Cellular Impact

Additional Notes:

• Marine viruses outnumber marine bacteria and are essential in controlling plankton populations.
• Transcriptional changes caused by viruses can induce apoptosis, immune evasion, or even oncogenesis.
• The false statements in the question reflect common misconceptions debunked by basic virology.