06micro3u - Lecture 06: Microbiology Chapter 7: Viruses The...

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Lecture 06: Microbiology Chapter 7: Viruses
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The Big Picture Characteristics of Viruses Our line(s) of defense part 3 of 3
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What are they? Viruses bridge the gap between the living and the non-living
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What are they? Outside of a host they are just like chemicals that can be stored on a shelf
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What are they? Inside of a host cell they replicate and adopt all other characteristics of life
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What are they not? Viruses are NOT cells! No plasma membrane No organelles They are parasites that cannot live independently
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Two-Part Terror Outside Capsid Made of protein Gives virus shape and protects DNA
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Two-Part Terror Inside Genetic material DNA (2 strands of nucleic acid) or RNA (1 strand of nucleic acid) DNA RNA
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Leeches Viruses reproduce by hijacking a host cell They cannot replicate their own genetic material Rely on host ribosomes and other enzymes
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Surgical Strikes Type of cell infected is specific to each virus Protein “feet” on capsid fit into specific receptors on host cell membrane
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Case Study: HIV http://www.dailymotion.com/video/x9xdic_ tomorrow-today-operating-onhivthe-v_tech 2005 data
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Cowpox virus
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06micro3u - Lecture 06: Microbiology Chapter 7: Viruses The...

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