wvu aem 341 lab final EXAM WITH ANSWERS

wvu aem 341 lab final EXAM WITH
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ANSWERS


3 cardinal temperatures
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Minimum temperature - lowest temperature that permits a
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microbe's growth and metabolism |\ |\ |\




Maximum temperature - highest temperature that permits a
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microbe's growth and metabolism |\ |\ |\




Optimum temperature - promotes the fastest rate of growth and
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metabolism




Psychrophiles
-5 C to 20 C ( 0-5 C)
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Mesophiles
20-40 C, human pathogens (35-45 C)
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Thermophiles
>50 C (~60 C)
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, Aerobic bacteria |\




requires oxygen for survival |\ |\ |\




Facultative anaerobic bacteria |\ |\




can exist either with or without oxygen
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Anaerobes
do not require oxygen and may even be killed by exposure
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NH3 turns phenol red to...
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deep pink (w/ alkaline)
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pH indicator
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phenol red |\




pH 7
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red