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.   hands washed with soap and water for 20 seconds
B.   disinfected bench top
C.   doorknob
D.   sterile surgical instrument
Question #2
All of the following are true about bacteria that live in or on our bodies, EXCEPT…
A.   They are not found on the skin
B.   They do not normally cause disease
C.   They outnumber the cells in the human body
D.   They can cause disease
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.   4˚C
B.   37˚C
C.   25˚C
D.   60˚C
Question #4
Which of the following can influence microbial growth?
A.   Temperature
B.   Atmospheric gases
C.   All of these can influence microbial growth
D.   Osmotic pressure
Question #5
The best time period to observe incubated cultures is between ________ hours.
A.   24-48
B.   4-Feb
C.   12-Apr
D.   72
Question #6
When working in the laboratory, aseptic techniques are important because…
A.   it helps to minimize contamination
B.   none of these are correct
C.   it allows for more growth of the bacteria
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.   FALSE
B.   TRUE
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.   heated on the bottom before incubation
B.   exposed to alcohol disinfection after dropping them
C.   labeled on the bottom
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.   without disinfecting the bench top
B.   keyboard
C.   cash
D.   after handwashing

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