The strange world of viruses

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Complete the text with the words provided to you, Read it very carefull. You can work in pairs.

Àlex MT

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Completar Frases The strange world of virusesVersión en línea Complete the text with the words provided to you, Read it very carefull. You can work in pairs. por Àlex MT 1 Nucleic infectious habitat shell reproduction cells move envelope small assemble alive influenza Capsid Viruses are not , so they are not really living things . They cannot carry out any vital functions . They are and they infect cells . They can reproduce . They are parasites because they always need a host . These are some of their main characteristics : · They are very . We can only observe them under an electronic microscope . · The are unable to , so they have no legs , flagellum or cillium . · Their is very extensive . They can be found on the ground , in the air and in the water . Viruses are very simple microorganisms . They have only 3 parts : · acid : It is the genetic material , protected by a capsule . · : It is a made of proteins that covers and protects the genetic material . It can have different shapes . Viruses like have a round shell . · Viral : It covers the capsid , but not all viruses have one . Only especial viruses like influenza or AIDS are covered by this particular shell . The infection process stars when the virus enters the cell . Then the virus starts the process , creating viral components from its genetic material . Later , the viral components and a new virus comes out from the cell .