Bio 2010 - Microbiology » Summer 2021 » Lab Quiz 1 (A)

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

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