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Unformatted text preview: various viruses that cause hepatitis invade only liver tissues, while the polio virus only reproduces in spinal nerve cells. Figure 5 shows a bacterial virus, as well as an HIV human virus. Viruses gain entry and are specific to a particular host cell because portions of the capsid (or spikes of the envelope) adhere to specific receptor sites on host cell plasma membrane. Their nucleic acid then enters the cell, where the viral genome codes for production of protein units in the capsid. Bacteriophages invade the host cell, take over the cell, and begin replicating viruses, eventually lysing or bursting the host cell, releasing the new viruses to infect additional cells. Figure 6 illustrates a typical T bacteriophage, as well as several of these viruses being assembled in a host....
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