BIO 203 Liberty University Exam 2
Questions Solved Correct .
Microbial Growth - Answer increases in number of cells, not cell size (populations, colonies)
Physical Requirements for Growth - Answer temperature, pH, osmotic pressure
Chemical Requirements for Growth - Answer carbon, nitrogen, sulfur, and phosphorous, trace
elements, oxygen, organic growth factor
Temperature Physical Requirements - Answer minimum, optimum, and maximum growth temperature
define psychrophiles - Answer thriving at low temperatures
define psychotrophs - Answer cold-loving microbes between 0*C and 20-30*C
define mesophiles - Answer A microorganism with an optimal temperature between 25-40°C
define thermophiles - Answer a microorganism that grows best at elevated temperatures
define hyperthermophiles - Answer requiring temperatures of 80°C (176°F) or higher to thrive
Psychotrophs - Answer cause food spoilage, provide an estimation of the product's shelf life, found in
soils, surface and deep sea waters, Antarctic ecosystems, food
temperatures between 65-130*C allow how much growth of bacteria? - Answer most bacteria are
destroyed
temperatures between 55-65*C allow how much growth of bacteria? - Answer very slow bacterial
growth
Questions Solved Correct .
Microbial Growth - Answer increases in number of cells, not cell size (populations, colonies)
Physical Requirements for Growth - Answer temperature, pH, osmotic pressure
Chemical Requirements for Growth - Answer carbon, nitrogen, sulfur, and phosphorous, trace
elements, oxygen, organic growth factor
Temperature Physical Requirements - Answer minimum, optimum, and maximum growth temperature
define psychrophiles - Answer thriving at low temperatures
define psychotrophs - Answer cold-loving microbes between 0*C and 20-30*C
define mesophiles - Answer A microorganism with an optimal temperature between 25-40°C
define thermophiles - Answer a microorganism that grows best at elevated temperatures
define hyperthermophiles - Answer requiring temperatures of 80°C (176°F) or higher to thrive
Psychotrophs - Answer cause food spoilage, provide an estimation of the product's shelf life, found in
soils, surface and deep sea waters, Antarctic ecosystems, food
temperatures between 65-130*C allow how much growth of bacteria? - Answer most bacteria are
destroyed
temperatures between 55-65*C allow how much growth of bacteria? - Answer very slow bacterial
growth
