15 Quiz AS X ccs.edu/courses/58059/quizzes/218241/take estion 9 10 pts hich of t
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15 Quiz AS X ccs.edu/courses/58059/quizzes/218241/take estion 9 10 pts hich of the following statements correctly describes the lysogenic cycle of lambda (W phage? After infection, the viral genes immediately turn the host cell into a lambda-producing factory, and the host cell then yses Most of the prophage genes are activated by the product of a particular prophage gene. The phage genome replicates along with the host genome. Certain environmental triggers can cause the ph o age to exit the host genome,switching from the lytic to the lysogenic. Question 10 10 pts In the lytic reproductive cycle of phages the viral capsid is assembled according to the genctic information of the bacteriurm phage DNA is incorporated into the host cel's genome O the cell typically dies, relcasing many copies of the virus DNA replication is not part of the life cycle the entire phage is taken inta the bacteriunExplanation / Answer
1) Option 3 is the correct answer.
In lysogenic cycle for phage reproduction, the phage DNA gets incorporated in the host genome and replicates alongside it. After many generations of replication, the phage switches to lytic cycle and the host cell bursts releasing several phage particles.
2) Option 3 is the correct answer.
In lytic cycle, the phage utilizes the bacterial replication and protein translation machinery to replicate its DNA and to synthesize it's capsid proteins. After the number of phage particles inside hostreaches a certain limit, the host cell bursts releasing all the phage particles in it.
3) Option 5, none of the answers are correct is the right answer.
Viruses outside host are completely inert with no cellular metabolism going on. Without host, viruses behave as non-living particles and can even be crystallized. It is only when they infect a host, that the regular metabolic activities such as genome replication, protein and ATP synthesis starts.
4) Retroviruses such as HIV use the enzyme reverse transcriptase to copy their RNA genome into DNA that can be inserted into the host genome. Retroviruses have RNA as their genetic material, hence when they get inside a host, they convert their RNA to DNA by means of reverse transcription in order to be able to replicate using the host machinery.
5) Bacteriophages can replicate by two alternative mechanisms, the lytic cycle and the lysogenic cycle. In lytic cycle, the bacterial cell burst releasing the newly formed phage particles, while in lysogenic cycle, the phage genome is incorporated in bacterial genome and replicates alonside it for many generations.
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