PATHOLOGY MCQ
IMMUNE RESPONSE
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Viral conjugation
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Lytic cycle
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Lysogeny
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None of the above
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Detailed explanation-1: -Lysogeny, or the lysogenic cycle, is one of two cycles of viral reproduction (the lytic cycle being the other). Lysogeny is characterized by integration of the bacteriophage nucleic acid into the host bacterium’s genome or formation of a circular replicon in the bacterial cytoplasm.
Detailed explanation-2: -In lysogenic infection, viral DNA gets integrated with the host cell’s DNA, where it is copied along with the host cell’s DNA when the host cell replicates.
Detailed explanation-3: -Some phages can only reproduce via a lytic lifecycle, in which they burst and kill their host cells. Other phages can alternate between a lytic lifecycle and a lysogenic lifecycle, in which they don’t kill the host cell (and are instead copied along with the host DNA each time the cell divides).
Detailed explanation-4: -The lysogenic cycle is one of the two methods of viral reproduction (the lytic cycle is the other one). In prokaryotes this cycle is characterized by integration of the bacteriophage nucleic acid into the genome of the host bacterium .
Detailed explanation-5: -In the lytic cycle, the virus attaches to the host cell and injects its DNA. Using the host’s cellular metabolism, the viral DNA begins to replicate and form proteins. Then fully formed viruses assemble. These viruses break, or lyse, the cell and spread to other cells to continue the cycle.