Bio 2010 - Microbiology » Summer 2021 » Lab Quiz 1

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Question #1
Choose the term below, that BEST completes the following statement. As magnification increases, the contrast:
A.   decreases
B.   stays the same
C.   increases
Question #2
Why is it important to flame the test tubes before and after transferring bacteria into fresh, sterile culture media?
A.   clean the tube for use in the future
B.   prevent contaminating the second culture tube
C.   more than one of the above is correct
D.   to seal the plastic lid on the tube
E.   none of the above is correct
Question #3
After making and incubating your Streak-for-Isolation plate a student notices that they have confluent growth in EVERY sector/quadrant. Which of the following most likely explains what happened?
A.   the bacteria spread through each sector during incubation
B.   they left the top of the Petri open too long during making the streak
C.   the tryptic soy agar plate was contaminated prior to making the streak
D.   they returned the flame loop to the broth between every sector/quadrant
Question #4
Which of the following choices is the BEST definition of depth-of-field?
A.   the ability to focus above or below a stained specimen
B.   the ability to distinguish two small objects as separate
C.   the distance between the end of the microscope objective lens and the specimen slide
D.   the image that one sees when looking through the oculars

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