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Sunday, November 22, 2020

Virus Replication Cycles

A virus must use cell processes to replicate. The viral replication cycle can produce dramatic biochemical and structural changes in the host cell which may cause cell damage.

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It is the first step of viral replication.

Virus replication cycles. It then injects its dna or rna into the host to initiate infection. The cell acts as a factory providing the substrates energy machinery necessary for synthesis of viral proteins and replication of the genome. Although the replicative life cycle of viruses differs greatly between species and category of virus there are six basic stages that are essential for viral replication.

Entry uncoating transcription mrna production synthesis of virus components virion assembly and. These changes called cytopathic causing cell damage effects can change cell functions or even destroy the cell. The virus replication occurs in seven stages namely.

Replication of virus by lysogenic cycle. Viral proteins on the capsid or phospholipid envelope interact with specific receptors on the host cellular surface. The phage involved in this cycle is called temperate phage the bacteri um is the lysogenic strain and the entire pro cess is called lysogeny fig.

The translation of viral proteins mainly depend on cell machinery of replication cell ribosomes. 1 entrance into the cell and release of the genome uncoating 2 transcription of the viral genes and 3 translation of the mrnas to form viral proteins 4 replication of the viral genome 5 assembly of new viral particles in the cell and release of the complete virions from the host cell 6. The replication cycle of a virus consists of five principal consecutive steps.

The virus attaches to the cell membrane of the host cell. Lwoff 1953 discovered this type of cycle in lambda w phages that attack e.

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