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Download Possible Origin of Viruses
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Emman Perez Joey Torres II-Sampaguita latin “virus” refers to poison and other noxious substances a small infectious agent that can replicate only inside living cells of organisms can infect ALL types of organisms regardless of size Very hard to see using normal microscope Most viruses have a diameter between 10-300 nanometres Have four main morphological virus types: 1. 2. 3. 4. Helical – spiral shaped Icosahedral – “near spherical” Envelope – envelope themselves in modified cell membranes Complex – possess extra structures such as protein tails and complex outer walls. Still unclear to most scientists Viruses do not leave any fossils They have to be untangled from their host cells 3 main Hypotheses: Regressive hypothesis Cellular origin hypothesis Coevolution hypothesis Louis Pasteur was unable to find a causative agent for rabies Charles Chamberland Dmitry Ivanovsky Invented a filter which had pores smaller than bacteria Tobacco Mosaic Virus Martinus Beijerinck the filtered solution contained a new form of infectious agent Vaccination Cheap and effective way of preventing infections Improves immunity Antiviral Drugs Nucleoside analogues DNA Chain Termination http://www.scientificamerican.com/article.cfm?id=expertswhere-did-viruses-come-fr http://en.wikipedia.org/wiki/Virus http://www.bookrags.com/research/evolutionary-origin-ofbacteria-and-wmi/
