APchapter18notes - Chapter18Notes Bacteria Concept18.1...

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    Chapter 18 Notes The Genetics of Viruses and  Bacteria
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    Concept 18.1 Researchers discovered viruses through  the understanding of tobacco mosaic  disease - stunts growth and causes discoloration  of leaves It was found that the pathogen could only  reproduce within the host it infected
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    Concept 18.1
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    Concept 18.1 A virus is a genome enclosed in a  protective coat - a virus can be a DNA virus or an RNA  virus depending on the kind of nucleic  acid - the protein shell that encloses the viral  genome is called the  capsid
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    Concept 18.1 - the capsid may be rod shaped,  polyhedral, or more complex Some viruses have  viral envelopes membranes that cloak their capsids - derived from the membrane of a host  cell
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    Concept 18.1 The most complex capsids are found  among  bacteriophages  (or  phages ),  viruses that infect bacteria
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    Concept 18.1
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    Concept 18.1 Viruses are  obligate intracellular  parasites : they can only reproduce  within a host cell - viruses lack the enzymes for  metabolism and have no ribosomes for  making proteins Viruses are merely packages sets of  genes in transit between hosts
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    Concept 18.1 Host range : the limited range of host  cells each type of virus can infect and  parasitize - viruses identify their host cells by a 
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This note was uploaded on 01/26/2011 for the course BIO 101 taught by Professor Siller during the Spring '10 term at University of Minnesota Duluth.

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APchapter18notes - Chapter18Notes Bacteria Concept18.1...

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