The given diagram shows different stages of lysogenic cycle of a temperate bacteriophage
Correct answer: B. III only.
- A. I only
- B. III only.
- C. I and II
- D. II and III
Explanation
Induction is the process where the prophage is activated and excises itself from the host chromosome, initiating the lytic cycle. So B is correct. At step 3, induction has occurred. At stage one, there is no induction. Only phage DNA became a part of bacterial DNA, which is a normal step of lysogenic cycle. At stage 2, bacteria normally divide, passing phage DNA into daughter cells. So A, C, and D are incorrect.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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