Chapter 35 VIRUSES

Chapter 35 VIRUSES - Chapter35VIRUSES Chapter35VIRUSES

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Chapter 35  VIRUSES “Bad news wrapped in protein.”  Sir Peter Medawar Summary Summary *What are viruses and why are scientists interested in them? *Morphology *Life cycles *Virus diversity Viruses – Are they Living Organisms? Viruses – Are they Living Organisms? *Tiny (50-100nm) “non-cellular particles”. *Obligate, intracellular parasites: *Cannot reproduce on their own. *Cannot carry on metabolic processes. *Do have hereditary material Why are Biologists Interested in Viruses? Why are Biologists Interested in Viruses? *Cause disease in just about every living organism. *Pandemics/Epidemics *“Spanish flu” *HIV/AIDS HIV/AIDS HIV/AIDS *HIV parasitizes and destroys cells called  helper T cells  and macrophages – part of  the human immune system.   *As the total number of helper T cells in the blood gradually declines the body is less  able to fight infections. Geographic Distribution of HIV Infections Geographic Distribution of HIV Infections Studying Viruses Studying Viruses *Why? 1
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This note was uploaded on 09/08/2011 for the course BIOL 1403 taught by Professor Dini during the Fall '09 term at Texas Tech.

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Chapter 35 VIRUSES - Chapter35VIRUSES Chapter35VIRUSES

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