Viruses2 - Viruses: a Group of Intracellular Parasites...

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Viruses: a Group of Intracellular Parasites Other bacteriophages can infect a host and insert their DNA into the host DNA. Under certain conditions the viral DNA can detach and direct replication of new virus, eventually killing the host cell. Once inside the cell, the nucleic acid follows one of two paths: lytic or lysogenic, as shown in Figure 7. Virus may have genes for a few special enzymes needed for the virus to reproduce and exit from the host cell. The virus relies on host enzymes, ribosomes, transfer RNA (tRNA), and ATP for its own replication. A virus in essence takes over the metabolic machinery of the host cell when it reproduces.
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The lytic cycle is one in which the virus takes over operation of the bacterium immediately upon entering it, with the production of new viruses and their subsequent release destroying the bacterium. The lysogenic cycle is seen when the virus incorporates its DNA into that of the bacterium, with some delay until the production of new viruses. Following attachment and penetration, viral DNA becomes integrated
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Viruses2 - Viruses: a Group of Intracellular Parasites...

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