Bis2C+lect+11+Rizzo+human+associated+microbes

Bis2C+lect+11+Rizzo+human+associated+microbes - Lecture 10:...

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Lecture 10: Viruses Lecture 11: Human- associated microbes Lecture 12: Intro to Eukaryotes
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Symbiosis
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A symbiosis represents: A. an interaction between two or more organisms in which all organisms benefit. B. an interaction between two organisms in which one organism benefits and another is negatively impacted. C. an interaction between two organisms in which one organism benefits and the other is not impacted in any way. D. a range of interactions between two or more organisms, including examples of choices 1, 2 and 3 above.
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Classes of symbiosis A B Mutualism + + Commensalism + 0 Parasitism + -
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Parasite: an organism living on or in another organism and obtaining its nutrients and energy at the expense of the second organism. A parasite may or may not be a pathogen. P athogen: a biological agent that causes disease to its host.
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Disease : injurious physiological activity caused by the continuous irritation by a primary causal factor and expressed in characteristic pathological conditions called symptoms
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Types of disease Infectious: a disease that is caused by a pathogen which can spread from a diseased to a healthy host. Non-infectious: a disease that is caused by an environmental or host factor. It is not spread between a diseased and healthy individual.
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Infectious diseases- 7 % Non-infectious diseases – 93% May, 2007
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Bis2C+lect+11+Rizzo+human+associated+microbes - Lecture 10:...

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