When a virus is in the lysogenic cycle, which of these will occur?
Correct answer: A. Viral DNA becomes incorporated into the host chromosome.
- A. Viral DNA becomes incorporated into the host chromosome.
- B. The host cell produces many new viruses before it breaks apart.
- C. The viral DNA replicates, and it is separated by the cell's spindle apparatus.
- D. Antiviral defenses of the cell expel the viral DNA.
Explanation
In the lysogenic cycle, the viral DNA integrates into the host cell's chromosome and becomes part of the host genome, forming a prophage (in bacteriophages) or provirus (in animal viruses). At this stage, the viral genes remain dormant and do not direct the host to produce new viruses. The other statements-production of many new viruses (lytic cycle), separation by the spindle apparatus, or expulsion by host defences-do not correctly describe the lysogenic cycle. The correct event is that viral DNA becomes incorporated into the host DNA.
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