Micro Exam 4 - MGCCC Exam Questions
with correct Answers
organisms that require organic sources of carbon and energy are called - correct
answerschemoheterotrophs
the ___ growth temperature is the temperature at which an organism exhibits the highest
growth rate - correct answersoptimum
a growth curve plots the ___ of organisms in a growing population over time - correct
answersnumber
T or F: in spectrophotometry, 40% light transmission is the same thing as 60% absorbance of
light - correct answersTRUE
T or F: obligate anaerobes have enzymes such as superoxide dismutase to protect them from
damaging effects of oxygen - correct answersFALSE
T or F: a selective medium can be formulated either by including inhibitory chemical
substances or by leaving out a single crucial nutrient - correct answersTRUE
Metabolic activity is at a max level in the ___ of growth - correct answerslog phase
a microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the generation
time of the species is 1 hour, and there is no lag phase, how long will it be before the culture
contains more than 10,000 cells/ml? - correct answers7 hours
, a cell that uses an organic carbon source and obtains energy from light would be called a -
correct answersphotoheterotroph
joan wants to discover a microbe capable of degrading an environmental contaminant. Which
of the following refers to the process she should use? - correct answersenrichment culture
a microorganism found living under conditions of high ___ is a barophile - correct
answershydrostatic pressure
all of the following ingredients might be found in complex media EXCEPT - correct
answershydrogen peroxide
the term barophile refers to which of the following growth requirements? - correct
answershydrostatic pressure
a clinical sample labeled as sputum was collected from - correct answersthe lungs
an acidophile thrives under conditions of low - correct answerspH
which of the following organisms would be most likely to contaminate a jar of pickles? -
correct answersan acidophile
a specimen of urine is determined to contain 30 bacterial cells per microliter. How many cells
would be present in a milliliter? - correct answers30,000
an epidemiologist is investigating a new disease and observes what appear to be bacteria
inside tissue cells in clinical samples from victims. The scientists wants to try to isolate the
bacteria in the lab. What culture conditions are most likely to be successful? - correct
answersinoculation of cell cultures
with correct Answers
organisms that require organic sources of carbon and energy are called - correct
answerschemoheterotrophs
the ___ growth temperature is the temperature at which an organism exhibits the highest
growth rate - correct answersoptimum
a growth curve plots the ___ of organisms in a growing population over time - correct
answersnumber
T or F: in spectrophotometry, 40% light transmission is the same thing as 60% absorbance of
light - correct answersTRUE
T or F: obligate anaerobes have enzymes such as superoxide dismutase to protect them from
damaging effects of oxygen - correct answersFALSE
T or F: a selective medium can be formulated either by including inhibitory chemical
substances or by leaving out a single crucial nutrient - correct answersTRUE
Metabolic activity is at a max level in the ___ of growth - correct answerslog phase
a microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the generation
time of the species is 1 hour, and there is no lag phase, how long will it be before the culture
contains more than 10,000 cells/ml? - correct answers7 hours
, a cell that uses an organic carbon source and obtains energy from light would be called a -
correct answersphotoheterotroph
joan wants to discover a microbe capable of degrading an environmental contaminant. Which
of the following refers to the process she should use? - correct answersenrichment culture
a microorganism found living under conditions of high ___ is a barophile - correct
answershydrostatic pressure
all of the following ingredients might be found in complex media EXCEPT - correct
answershydrogen peroxide
the term barophile refers to which of the following growth requirements? - correct
answershydrostatic pressure
a clinical sample labeled as sputum was collected from - correct answersthe lungs
an acidophile thrives under conditions of low - correct answerspH
which of the following organisms would be most likely to contaminate a jar of pickles? -
correct answersan acidophile
a specimen of urine is determined to contain 30 bacterial cells per microliter. How many cells
would be present in a milliliter? - correct answers30,000
an epidemiologist is investigating a new disease and observes what appear to be bacteria
inside tissue cells in clinical samples from victims. The scientists wants to try to isolate the
bacteria in the lab. What culture conditions are most likely to be successful? - correct
answersinoculation of cell cultures
