Microbiology 020 - General Microbiology » Fall 2020 » Lab Quiz 2

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Question #1
Which of the following items is most likely to show bacterial or fungal growth if sampled onto a general purpose medium?
A.   doorknob
B.   sterile surgical instrument
C.   disinfected bench top
D.   hands washed with soap and water for 20 seconds
Question #2
All of the following are true about bacteria that live in or on our bodies, EXCEPT…
A.   They can cause disease
B.   They outnumber the cells in the human body
C.   They do not normally cause disease
D.   They are not found on the skin
Question #3
Most of the bacteria we study, especially the ones most likely to make us sick, prefer moderately warm temperatures, like our internal body temperature. Most bacterial cultures, then, are incubated at…
A.   60˚C
B.   4˚C
C.   25˚C
D.   37˚C
Question #4
Which of the following can influence microbial growth?
A.   All of these can influence microbial growth
B.   Atmospheric gases
C.   Osmotic pressure
D.   Temperature
Question #5
The best time period to observe incubated cultures is between ________ hours.
A.   24-48
B.   72
C.   12-Apr
D.   4-Feb
Question #6
When working in the laboratory, aseptic techniques are important because…
A.   it allows for more growth of the bacteria
B.   none of these are correct
C.   it helps to minimize contamination
D.   it allows you to keep accurate measurements
Question #7
If you have good memory, you do NOT need to label petri dishes with the names of the samples collected.
A.   TRUE
B.   FALSE
Question #8
You accidentally drop a stack of agar plates as you take them to the lab bench for observation. A few lids were separated from the plates. You may still be able to evaluate your results if the plates were…
A.   labeled on the bottom
B.   heated on the bottom before incubation
C.   exposed to alcohol disinfection after dropping them
D.   labeled on the lid
Question #9
In the lab simulation, you compared growth of bacteria from several different environments and situations. Which of the following showed the least bacterial growth?
A.   cash
B.   after handwashing
C.   keyboard
D.   without disinfecting the bench top

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