| Term | Definition |
|---|
| 300 | Approximate number of microbial species in the human large intestine |
| normal flora | Microbial residents associated with healthy individuals |
| aid digestion, supply essential growth requirements, stimulate immune system, aid resistance to infection | Four benefits of normal microbial flora |
| symbiosis | Living together of organisms |
| mutualism, commensalism, parasitism | The three types of symbiosis |
| mutualism | Symbiosis where both partners benefit |
| commensalism | Symbiosis where one partner benefits and the other is not affected |
| parasitism | Symbiosis where one partner benefits and the other is harmed |
| mutualists, symbionts | Terms for symbiotic partners existing in mutualism |
| commensals | Term for symbiotic partners existing in commensalism |
| parasitic organism | Term for partner that is harming the other in parasitism |
| protozoa, worms, helminth | The term "parasite" refers specifically to what sort of organisms? |
| pathogen | A parasitic organism that causes a specific disease |
| obligatory | Mutualism is frequently ____ for one partner |
| how we define harm | What is the boundary between commensalism and parasitism dependent on? |
| dynamic | Symbiosis is a ____ relationship |
| number of organisms, virulence of organisms, host's resistance | The 3 factors governing symbiosis |
| increase | A ____ in organism numbers leads to a shift to parasitism |
| increase | A ____ in virulence leads to a shift to parasitism |
| decrease | A ____ in resistance leads to a shift to parasitism |
| virulence | Degree or intensity of pathogenicity |
| coronavirus | 2003 SARS epidemic caused by increased virulence of... |
| live / reproduce efficiently, not harm host | 2 goals of parasitic organisms |
| how similar organisms are | What do the lengths of lines of a phylogenetic tree reflect? |
| eating contaminated or undercooked meat | How do tapeworms infect a human host? |
| food / shelter, reproduction | 2 advantages of parasitism |
| reproduction / replication | The main goal of parasitism |
| hostile environment, constantly under threat, reliance on host | 3 disadvantages of parasitism |
| battle | Parasitism can be viewed as a continuing _____ |
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