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Unformatted text preview: T Cell HIV Dr. Elrod Doug HH 214 565-4184 The Discovery of Viruses Not considered an Organism Life? Life is metabolism Reproduction (ultimate goal) Growth DNA/RNA Response to stimuli Viruses process only a portion of the properties of organisms o Segments of DNA or RNA wrapped in a protein coat o Important biological entities Must reproduce within cells o Vary greatly In appearance and size Viral structure core of nucleic acid (DNA or RNA) surrounded by protein o Classified by nature of genomes RNA-based viruses retroviruses o Nearly all form a protein sheath or capsid around their nucleic acid core Many animal viruses form an envelope around the capsid. Host range suitable cells for a virus Viral Replication Viruses can reproduce only when they enter cells and utilize the hosts cellular machinery. o Genes translated into proteins by the cells genetic machinery o Lead to production of more viruses Viral Shape o helical - rodlike o Isometric Spiral Isoahedron-20 equilateral triangle facets *Table 26.1* Baceteriophages Bacteriophages viruses that infect bacteria o Some named as members of a T series Lytic cycle...
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