UTK Bio 220 Karen Lloyd Spring 2025 Final Exam questions with answers.

UTK Bio 220 Karen Lloyd Spring 2025
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Final Exam questions with answers |\ |\ |\ |\




all microbes in us and on us - CORRECT ANSWERS ✔✔The
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human microbiota
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how many more times more bacterial cells can be found
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in/on the human body than human cells? - CORRECT
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ANSWERS ✔✔10x |\




pathogens that take advantage of a compromised host |\ |\ |\ |\ |\ |\ |\ |\



and are usually only pathogenic in these hosts - CORRECT
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ANSWERS ✔✔oppurtunistic pathogen
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by what age is the human microbiome usually set by -
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CORRECT ANSWERS ✔✔3 years old |\ |\ |\ |\




idea that human civilization's departure from exposure to
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animals/dirt/feces/etc is the cause of certain human |\ |\ |\ |\ |\ |\ |\



inflammatory diseases - CORRECT ANSWERS ✔✔hygeine |\ |\ |\ |\ |\ |\



hypothesis


dry, salty, acidic, presence of protective oils, as well as
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the fact that it is washed often are all reasons that the
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,[blank] is difficult for microbes to colonize - CORRECT
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ANSWERS ✔✔Skin |\




Microbes that live on the skin are mostly [blank], as these
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organisms are generally tougher - CORRECT ANSWERS
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✔✔gram-positive


potential for health issues due to oral microbes entering
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the blood stream - CORRECT ANSWERS ✔✔bacteremia
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the lungs and trachea are usually kept sterile thanks to
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[blank] that help to keep mucous out - CORRECT
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ANSWERS ✔✔ciliated mucous linings |\ |\ |\




Term for the apparatus of mucus and cilia; responsible for
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movement of mucus up and out of the respiratory tract -
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CORRECT ANSWERS ✔✔mucocilliary escalator
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what health issue are enterobactericea known to cause -
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CORRECT ANSWERS ✔✔Urinary tract infections (UTI)
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what is the pH of the stomach - CORRECT ANSWERS
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✔✔very acidic (1.5-3.5)
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, what species of bacteria causes stomach ulcers -
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CORRECT ANSWERS ✔✔Helicobacter pylori |\ |\ |\




About how many bacteria live in the intestines? -
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CORRECT ANSWERS ✔✔10^11 - 10^13 / gram of feces
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What may cause a drop in acidity within the stomach
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potentially allowing for microbes to survive in the
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stomach and make their way into the intestines? Name
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an example of a microbe that may do this. - CORRECT
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ANSWERS ✔✔Malnourishment, Vibriocholera |\ |\




What is the ratio of anaerobes to aerobes within the
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intestines - CORRECT ANSWERS ✔✔1000-1 |\ |\ |\ |\




What species is among the first to colonize the intestines?
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- CORRECT ANSWERS ✔✔E.coli
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What do e.coli do to the environment of the intestines,
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after initially colonizing the intestines? - CORRECT
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ANSWERS ✔✔remove oxygen from the gut, allowing strict
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anaerobes to begin colonization
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