Cold and Flu
Viruses (biological)
Cell Biology (cytology)

What is the lytic cycle?


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2013-07-17 16:08:36
2013-07-17 16:08:36

The lytic cycle is one of two methods of viral reproduction, the other being the lysogenic cycle. These cycles should not, however, be seen as separate, but rather as somewhat interchangeable. The lytic cycle is typically considered the main method of viral replication (reproduction), since it results in the destruction of the infected cell.

The lytic cycle is often described in steps, sometimes three steps, sometimes five steps or six steps. But all describe the same process. See the related question below for more information about the steps of the lytic cycle.

Penetration To infect a cell, a virus must first enter the cell through the plasma membrane and (if present) the cell wall. Viruses do so by either attaching to a receptor on the cell's surface or by simple mechanical force. The virus then releases its genetic material (either single- or double-stranded DNA or RNA) into the cell. In doing, the cell is infected and can also be targeted by the immune system.

Biosynthesis The virus' nucleic acid uses the host cell's machinery to make large amounts of viral components. In the case of DNA viruses, the DNA transcribes itself into messenger RNA (mRNA) molecules that are then used to direct the cell's ribosomes. One of the first polypeptides to be translated is one that destroys the hosts' DNA. In retroviruses (which inject an RNA strand), a unique enzyme called reverse transcriptase transcribes the viral RNA into DNA, which is then transcribed again into mRNA.

Maturation and lysis After many copies of viral components are made, they are assembled into complete viruses. The phage then directs production of an enzyme that breaks down the bacteria cell wall and allows fluid to enter. The cell eventually becomes filled with viruses (typically 100-200) and liquid, and bursts, or lyses; thus giving the lytic cycle its name. The new viruses are then free to infect other cells.

Lytic cycle without lysis Some viruses escape the host cell without bursting the cell membrane, but rather bud off from it by taking a portion of the membrane with them. Because it otherwise is characteristic of the lytic cycle in other steps, it still belongs to this category. Hepatitis C viruses presumably use this method.

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Related Questions

Some do have a lytic cycle but some have a lysogenic cycle. The common cold is a virus that has a lytic cycle. HIV has a lysogenic (hides) cycle.

Yes rabies is lytic. The lytic cycle is a cycle of viral reproduction and is how some diseases are spread.

the lytic cycle concludes with the host cell being burst open releasing more viruses which then repeats the lytic cycle

The lytic cycle is one that produces more flu particles. The bird flu doesn't have a lysogenic cycle or hidden cycle. It has only a lytic cycle.

The same steps outlined in the lytic cycle apply to influenza. See the related question for more information about the lytic cycle and the steps involved.

The last step in the lytic cycle is that new viruses begin to be made

Lytic cycle and lysogenic cycleThe difference is that in lytic cycle, the virus kills the cell immediately.

Smallpox goes through a lytic cycle as it does not become dormant.

the lytic cycle causes disease apex 2.1.6 During the iysogenic cycle, the cell is not killed

In the lytic cycle, the virus lyses, or destroys the host cell after the virus has reproduced using the host cell's machinery. In the lysogenic cycle, this does not happen. A virus in the lysogenic cycle can, however, enter the lytic cycle.

Through the viral process called the Lytic Cycle. Read more about the lytic cycle in the related questions below.

The lytic cycle causes destruction of infected cells and their membrane. A virus that uses a lytic cycle reproduces itself or makes copies that are sent back into the environment and they are called virulent viruses.

After the viral multiplication cycle in the lytic cycle, the host cell dies. The host cell does not 'die' in the lysogenic cycle.

tuberculosis is caused by a bacterium. lytic and lysogeinc cycles are a part of viral life-cycle.

One group of viruses that follow the lytic cycle is the T-even Bacteriophage group. Their host is E.coli.

Lytic Cycle and Lysogenic Cycle.

Yes, viruses do undergo the lytic and lysogenic cycle. Depending on what type of virus determines which process they undergo.

A lytic virus will destroy its' host cell at the end of the lytic cycle.

The only thing the lytic cycle is more efficient in is killing the cell. The lytic cycle is when the initiation of making lots of bacteria copies begin. Once complete, the cell bursts and the virus products will scatter and infect other cells.

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