炭疽病（Anthrax）ppt课件

of a specific hostРglycoproteinsРprotein?coatРenvelope?(lipid bilayer)РspikesРcore?proteinsРreverse?transcriptaseРic material?(viral RNA) ?coated with proteinРWhy are viruses unable to replicate outside of a host cell?РViruses Are Host-SpecificРHost-specific:? Each type of virus is specialized to attack a specific host cells?anism is immune to all virusesРBacteriophageРViruses that infect bacteria?Treatment of the patients infected by bacteria with bacteriophage?Advantages:?Bacteria e increasingly resistant to antibiotics?Host specificity?Harmless to beneficial bacteriaРbacteriophages are seen attacking a bacterium. They have injected their ic material inside, leaving their protein coats clinging to the bacterial cell wall. The black objects inside the bacterium are newly forming viruses.