Bio 2010 - Microbiology » Summer 2023 » Lab Quiz 1

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Question #1
The magnification of an ocular lens in our lab is 10X. If the scanning lens is used when viewing a specimen, the total magnification would be
A.   1000X
B.   40X
C.   400X
D.   100X
Question #2
We use immersion oil between the 100X lens and the slide to prevent refraction of light because
A.   immersion oil has the same refractive index as air.
B.   immersion oil increases the depth of field.
C.   the source of illumination on our microscopes is not bright enough.
D.   immersion oil has the same refractive index as glass.
Question #3
Which of the following allows you control the amount of light that is focused on a slide?
A.   diaphragm
B.   condenser lens
C.   objective lens
D.   course adjustment knob
Question #4
What is the total magnification of a specimen viewed with a 10x ocular lens and a 45x objective lens?
A.   450x
B.   100x
C.   10x
D.   4.5x
E.   45x
Question #5
Brownian motion is
A.   a form of behavior commonly seen in bacterial cells that are motile.
B.   the random vibration of molecules and small objects caused by bombardment of these objects by water molecules that are constantly in motion.
C.   another term for condensation.
D.   the result of the true directional movement of a bacterial cell.
Question #6
__________ is the term we use to describe simple bacterial behaviors such as moving toward or away from a stimulus.
A.   Taxis
B.   Brownian motion
C.   Run
D.   Tumble
Question #7
The substance we use to solidify a liquid medium is called
A.   gelatin.
B.   agar.
C.   salt.
D.   protein.
Question #8
Which of the following is a form of microbiological medium we use in our lab?
A.   all of these
B.   nutrient broth
C.   agar slant
D.   agar plate
Question #9
At what temperature does agar normally solidify?
A.   50 °C
B.   100 °C
C.   40 °C
D.   45 °C

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