bio 210exam3studyguide[1] - Bio 210 Study Guide for Exam 3...

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Bio 210 Study Guide for Exam 3 1. Describe how the following factors influence microbial growth: Temperature, Yes. The warmer/humid the temperature, the faster the bacteria growth. Lower temperatures will inhibit bacterial growth, but not kill bacteria. The best temperature for growing bacteria is the human body temperature (98.6 degrees F) which is when they grow the fastest. Their growth will slow at higher and lower temperatures. (Except in a few cases where the bacteria prefer much higher or much lower temperatures.) The only way to kill bacteria is to keep the temperature over 158 degrees F for two minuites. Bacteria have an optimal temperature for growth, yes, but the temperature varies with the microbe. Bacteria are split into classes based on where the optimal growth temp. falls. The edges of the groupings are fuzzy, but the approx. ranges are: 1. Extreme psychophiles (or psychotrophs) -- below -5 o C 2. Psychophiles (or psychotrophs) -- -5 o C to 25 o C 3. Mesophiles-- 25 o C to 45 o C 4. Thermophiles-- 45 o C to 70 o C 5. Extreme thermophiles-- above 70 o C There is overlap and different sources will have different ranges, but these categories
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bio 210exam3studyguide[1] - Bio 210 Study Guide for Exam 3...

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