Cycle Live of Viruses
Certain type of virus exists in several forms of stages. The free virus particle, or virion, consists of a molecule of nucleic acid, either DNA or RNA, depending on the specific virus, surrounded by protein and in some viruses, also lipid and carbohydrate. The virion is inert, because its lacks many of the components that are necessary for independent life and reproduction; it does, however, provide for the transfer of the nucleic acid from host cell to host cell. Replication can occur only when the nucleic acid enters a host cell. Within the cell, the nucleic acid functions as genetic material and directs the synthesis of proteins. This results in the production of new virions, which then are released from the cell and can initiate new cycles of infection.
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How the virus reproduce:
Viruses reproduction begins when the virion comes into contact with a suitable host cell. The DNA or RNA enters the host cell and begins to function as genetic information by directing the synthesis of specific types of proteins that have enzymatic and structural roles. The infectious cycle usually consists of two different stages. In the first, the proteins are produced that are required for the reproduction of the viral DNA or RNA in conjunction with components of the host cell. In the second stage, proteins that make up the virion are produced; these combine with the DNA or RNA to form mature virions, which are the released from the cell. In some cases this release involves the complete disruption and death of the cell, a process known as lysis. In other cases individual virions are released through the cell membrane without killing the cell.
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