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. A

   Only one

   Only one. All three ‘no virus can…’ lines are false.

2. B

   Only two

   Only two. There is no correct pair here.

3. C

   All the three

   All three. Viruses do survive in oceans, infect bacteria (bacteriophages), and alter host transcription.

4. D

   None

   None. Each absolute ‘no virus can’ claim fails.

Summary. Official Set A key is (d) none. Oceans are full of viruses. Bacteriophages infect bacteria. Viruses routinely hijack host transcription. I, II and III are all false universals. The official count of correct statements is zero.