MICR130: MODULE 4 Exam Questions With Complete Solutions
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MICR130: MODULE 4
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MICR130: MODULE 4
MICR130: MODULE 4 Exam Questions With Complete Solutions
A bacterial culture increases from 2 million to 8 million cells in 2 hours. The generation time at this time is ___. - Answer-1 hour
/.Acidophiles would be expected to grow best at a pH of ____. - Answer-3
/.Aerobic bacteria that hav...
A bacterial culture increases from 2 million to 8 million cells in 2 hours. The generation
time at this time is ___. - Answer-1 hour
/.Acidophiles would be expected to grow best at a pH of ____. - Answer-3
/.Aerobic bacteria that have developed (or retain) the ability to continue growing in the
absence of oxygen are called _____. - Answer-facultative anaerobes
/.All of the following are true about agar except ______. - Answer-it is a source of
nutrients in culture media
/.All of the following are true about agar except ____. - Answer-it is a source of nutrients
in culture media
/.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
/.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
/.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
/.Bacterial growth is defined as ____. - Answer-increase in bacterial cell population
/.Cells that live in high salt environments are called ____. - Answer-halophiles
/.Coffee has a pH of approximately 5. What type of microbe can grow in your coffee? -
Answer-acidophile
/.During which phases of the bacterial growth curve are there no changes in the number
of living cells? - Answer-lag phase and stationary phase
/.For a thermophile, the minimum growth temperature would be ____C. - Answer-45
/.In which phase is the rate of cell death equal to the rate of cell growth? - Answer-
Stationary phase
, /.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)
/.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
Clostridium botulinum (an obligate anaerobe) in the presence of oxygen? - Answer-c
(constant)
/.Luria Broth (LB) is a medium containing tryptone, yeast extract, and sodium chloride. -
Answer-LB is a complex medium
/.Luria Broth (LB) is a medium containing Tryptone, yeast extract, and sodium chloride. -
Answer-LB is a complex medium.
/.Most bacteria reproduce by ______. - Answer-binary fission
/.Most human pathogens are _________. - Answer-mesophiles
/.Patients with indwelling catheters are susceptible to infections because ____. -
Answer-biofilms develop on catheters
/.Patients with indwelling catheters are susceptible to infections because ____. -
Answer-biofilms develop on catheters
/.Pencillin functions by inhibiting the formation of new cell walls. At what stage of
bacterial growth is penicillin most effectibe? Hint - when do you think cells are making
new cell walls? - Answer-log
/.Penicillin functions by inhibiting the formation of new cell walls. At what stage of
bacterial growth is penicillin most effective? Hint - when do you think cells are making
new cell walls? - Answer-Log
/.Protein synthesis during lag phase is not occurring because cells are not actively
dividing. - Answer-False
/.Salts and sugars work to preserve foods by creating a ____. - Answer-hypertonic
environment
/.Salts and sugars work to preserve foods by creating a ___. - Answer-hypertonic
environment
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