Bio 235 Exam 2 Questions and Answers 100% Pass

Bio 235 Exam 2 Questions and Answers
100% Pass


Serratia marcescens - ✔✔-gram negative


-bacillus


-ubiquitous


-opportunistic


Microbial Growth - ✔✔increase in number of cells not size


-populations


-colonies


Physical Requirements for Growth - ✔✔Temperature


pH


osmotic pressure



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, Temperature: Minimum Growth - ✔✔lowest temperature at which growth

is still possible


Temperature: Optimum growth - ✔✔Temperature at which the organism

grows the best


Temperature: Maximum growth - ✔✔Highest temperature at which the

organism can still divide.


Psychrophiles - ✔✔cold-loving


Mesopholes - ✔✔moderate-temperature loving (us)


Thermophiles - ✔✔heat-loving (Archaea), hot springs and organic compost


Psychrotrophs - ✔✔food-micro, cause food spoilage, can grow in

refrigeration.


Hyperthermophiles - ✔✔optimum growth is above 80 celsius


pH requirements - ✔✔-most bacteria grow between 6.5 and 7.5 pH


-mold and yeast grow between 5 and 6


Acidophiles - ✔✔grow in acidic environments


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