HUMAN MICROBIOTA

HUMAN MICROBIOTA - BIOL 351 Fall 2011 Human Microbiota SQ 1...

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BIOL 351 Fall 2011 1 Human Microbiota SQ 1) Be able to define the following terms: symbiosis, ectosymbiont, endosymbiont, consortium, mutualism, cooperation, commensalisms, and parasitism. Note that the textbook's definition for symbiosis is broader than the commonly used definition. Be sure you understand and can explain the textbook's definition. Symbiosis: The living together or close association of two dissimilar organisms; each of the organisms is a symbiont. Ectosymbiont: An organism that lives on or outside the body of another organism in a symbiotic association. Endosymbiont: An organism that lives within the body of another organism in a symbiotic association. Consortium: A physical association of two different organisms, usually beneficial to both organisms. Mutualism: A type of symbiosis in which both partners gain from the association and are unable to survive without it. Mutualist and host are metabolically dependent on each other. Cooperation: A positive but not obligatory interaction between two different organisms. Commensalisms: Living on or within another organism without injuring or benefiting the other organism. Usually the smaller organism is the commensal. Parasitism: A type of symbiosis in which one organism benefits from the other and the host is usually harmed. 2) During the lecture on 11/11/11, I told you about the leaf-cutting Attine ants that farm fungi. The fungi that are cultivated belong to the genus Leucoprini . Be able to explain: how the ants cultivate the fungus, how the ants use the fungus for food, how the ants use bacteria to prevent growth of a parasitic fungus ( Escovopsis ). This community is described on pages 726-728 of the textbook. Growing: They grow a Leucoprini fungus garden by cultivating it much like a human cultivates a farm. They bring nutrients to the fungus as leaves and other organic matter that the fungus consumes to grow. Food:Ants feed on the Leucoprini fungus (???)
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This note was uploaded on 02/17/2012 for the course BIOL 351 taught by Professor Sig during the Fall '08 term at Texas A&M.

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HUMAN MICROBIOTA - BIOL 351 Fall 2011 Human Microbiota SQ 1...

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