October 16-ch19 - October 16, 2007 Chapter 19 Viruses...

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October 16, 2007 Chapter 19 Viruses Characteristics of a virus o No cell membrane, no cytoplasm, no ribosomes – not a living thing o Can only reproduce inside a host cell o Very small size (0.05-0.2 micrometers) o Variety of shapes Two major components constitute a virus o Single or double stranded DNA or RNA as hereditary material o Protein coat May be surrounded by en envelope formed from the plasma membrane of the host cell Cannot grow of reproduce on their own Have a specialized protein coat that enables entry into a host cell Viral genetic material hijacks host cell to produce new viral components Viral components assemble rapidly into new viruses and burst from host cell Each viral type specialized to attach specific host cell Viruses are Host specific Bacteriophages can treat bacterial diseases o Rise in bacterial antibiotic resistances makes standard drugs less effective o Bacteriophages specifically target host bacteria o Bacteriophages are harmless to human body cells
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October 16-ch19 - October 16, 2007 Chapter 19 Viruses...

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