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?

Viruses are abundant in ocean waters; marine viruses (mostly bacteriophages) are the most numerous biological entities in the ocean, so statement I is incorrect. Bacteriophages are viruses that specifically infect bacteria, so statement II is incorrect. Many viruses alter host cell transcription — for example, HIV, herpesviruses, and SARS-CoV-2 modulate host gene transcription as part of their replication strategy — so statement III is also incorrect. None of the statements is correct.