MICR130 Module 4 Test Questions with Answers
Which of the following is NOT a direct method to measure microbial growth? - Answer-Metabolic activity
Patients with indwelling catheters are susceptible to infections because ____. - Answer-biofilms develop on catheters
Which of these microbes is...
Which of the following is NOT a direct method to measure microbial growth? - Answer-
Metabolic activity
Patients with indwelling catheters are susceptible to infections because ____. - Answer-
biofilms develop on catheters
Which of these microbes is most likely to grow at room temperature (25 C)? - Answer-
Psychrotroph
Look at the attached figure. Which of these growth curves best describes the growth of
a psychrophile at room temperature (25 C)? - Answer-c
(constant)
Look at the attached figure. Which of these growth curves best describes the growth of
a facultative anaerobe in the presence of oxygen? - Answer-a
(highest line)
View the attached bacterial growth curve. In the figure, which sections of the graph
illustrate a logarithmic increase in cell numbers? - Answer-b
View the attached figure. Which tube shows the expected growth pattern for a
microaerophile? - Answer-e
Luria Broth (LB) is a medium containing Tryptone, yeast extract, and sodium chloride. -
Answer-LB is a complex medium.
Which pH is considered alkaline? - Answer-10
Protein synthesis during lag phase is not occurring because cells are not actively
dividing. - Answer-False
View the attached figure. Which tube shows the expected growth pattern for a
facultative anaerobe? - Answer-b
Assume you inoculated 100 cells into 100 ml of nutrient broth. You then inoculated 100
cells of the same species into 200 ml of nutrient broth. After incubation for 24 hours, you
should have _____. - Answer-the same number of cells in both
, Which of the following classes of microorganisms would have an optimum growth rate
at 62°C? - Answer-Thermophiles
Patients with indwelling catheters are susceptible to infections because ____. - Answer-
biofilms develop on catheters
All of the following are true about agar except ______. - Answer-it is a source of
nutrients in culture media
The source of nutrients in a complex nutrient agar could be ______. - Answer-peptone
and beef extract
You have a bacterial culture consisting of 2 cells. Assuming the population is growing
exponentially, how many cells will be in the culture after 3 hours of growth if the
generation time is 30 minutes? - Answer-128
Which of the following is an advantage of the direct microscopic count? - Answer-
Requires no incubation time.
What toxic oxygen form of oxygen does the enzyme catalase detoxify? - Answer-
Peroxide anion (hydrogen peroxide)
View the attached bacterial growth curve. In the figure, which section (or sections)
shows a growth phase where the number of cells dying equals the number of cells
dividing? - Answer-c
The large intestine is an environment that lacks any oxygen. Which of the following
types of organisms would most likely be found there? - Answer-Obligate anaerobe
All of the following are true about agar except ____. - Answer-it is a source of nutrients
in culture media
At which stage of bacterial growth is cell division the most rapid? - Answer-log
Bacterial growth is defined as ____. - Answer-increase in bacterial cell population
Cells that live in high salt environments are called ____. - Answer-halophiles
During which phases of the bacterial growth curve are there no changes in the number
of living cells? - Answer-lag phase and stationary phase
Luria Broth (LB) is a medium containing tryptone, yeast extract, and sodium chloride. -
Answer-LB is a complex medium
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