Viral Replication Lytic And Lysogenic Cycles Pdf
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- Friday, January 29, 2021 12:27:10 AM
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The upcoming discussion will update you about the difference between Lysogenic and Lytic Phases of a Virus.
- 21.2B: The Lytic and Lysogenic Cycles of Bacteriophages
- Virus Life Cycle
- Virus: Reproduction
The lytic cycle results in the destruction of the infected cell and its membrane. Bacteriophages that only use the lytic cycle are called virulent phages in contrast to temperate phages. In the lytic cycle, the viral DNA exists as a separate free floating molecule within the bacterial cell, and replicates separately from the host bacterial DNA, whereas in the lysogenic cycle, the viral DNA is located within the host DNA. This is the key difference between the lytic and lysogenic bacterio phage cycles. The lytic cycle, which is also referred to as the "reproductive cycle" of the bacteriophage, is a six-stage cycle.
21.2B: The Lytic and Lysogenic Cycles of Bacteriophages
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. In this condition the bacterium continues to live and reproduce normally. The genetic material of the bacteriophage, called a prophage , can be transmitted to daughter cells at each subsequent cell division, and at later events such as UV radiation or the presence of certain chemicals can release it, causing proliferation of new phages via the lytic cycle. The difference between lysogenic and lytic cycles is that, in lysogenic cycles, the spread of the viral DNA occurs through the usual prokaryotic reproduction, whereas a lytic cycle is more immediate in that it results in many copies of the virus being created very quickly and the cell is destroyed.
Viruses like the ones pictured above are very tiny nonliving particles. Viruses do not carry out respiration. They also do not grow or reproduce on their own. A virus needs a living cell in order to reproduce. The living cell in which the virus reproduces is called a host cell. Let's look at what happens when a virus attacks our cells.
Virus Life Cycle
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Viruses are obligate intracellular parasites. Viruses must gain entry into target cells and usurp the host cellular machinery to produce a progeny virus. Here, the steps involved in the virus life cycle are described with emphasis on entry and exit. Therefore, viruses must gain entry into target cells and usurp the host cellular machinery to propagate and to produce progeny viruses. Here, we focus on entry and exit, in which the commonality of mechanisms among viruses prevails.
Bacteriophage , also called phage or bacterial virus , any of a group of viruses that infect bacteria. Bacteriophages were discovered independently by Frederick W. Bacteriophages also infect the single-celled prokaryotic organisms known as archaea.
Viruses are often very specific as to which hosts and which cells within the host they will infect. This feature of a virus makes it specific to one or a few species of life on earth.
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