Which event occurs in the lysogenic cycle but never in the lytic cycle?
Correct answer: D. Integration of viral DNA into the host chromosome
- A. Synthesis of viral coat proteins
- B. Injection of viral nucleic acid into the host
- C. Attachment of the virus to the host cell
- D. Integration of viral DNA into the host chromosome
Explanation
In lysogeny the phage DNA becomes part of the bacterial chromosome as a prophage and is copied silently every time the bacterium divides, which is the one step the lytic cycle has no equivalent of. Attachment and injection begin both cycles, and coat protein synthesis happens in the lytic cycle and in a lysogenic cell only after induction switches it to the lytic pathway.
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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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