Bio 2010 - Microbiology » Spring 2023 » Lab Quiz 3

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Question #1
Organisms that can withstand high temperatures are said to be
A.   mesophilic
B.   resistant
C.   psychrophilic
D.   thermoduric
Question #2
The temperature it takes to kill an entire population of microbes after incubation for 10 minutes at a pH of 7 is called the
A.   thermal death point.
B.   decimal reduction time.
C.   point of saturation.
D.   thermal death time.
Question #3
Disinfectants are chemical compounds that reduce and inhibit the growth of microorganisms on
A.   hair.
B.   inanimate objects.
C.   eyes.
D.   skin and mucus membranes.
Question #4
Which of the following is considered non-ionizing radiation?
A.   gamma
B.   UV
C.   x-ray
Question #5
Light with wavelengths between 250-260 nM affects __________ in cells.
A.   RNA
B.   DNA pyrimidines
C.   DNA purines
D.   protein structure
Question #6
Exoenzymes
A.   are biosynthetic enzymes that join organic molecules together.
B.   are synthesized outside the cells and transported inside.
C.   are only produced by eukaryotic cells.
D.   are synthesized inside the cell and transported outside.
Question #7
We use this agar to determine if an organism produces the exoenzyme caseinase.
A.   spirit blue
B.   starch
C.   nutrient gelatin
D.   skim milk
Question #8
This indicator solution is used to show the presence of starch.
A.   phenol red
B.   iodine
C.   spirit blue
D.   sodium hydroxide
Question #9
A positive indication of the presence of the exoenzyme lipase is
A.   a dark blue halo around the streak of an organism on a spirit blue plate.
B.   liquefaction of agar in a nutrient gelatin tube.
C.   cloudiness in a TSA broth.
D.   a clearing of the cloudy agar on a skim milk plate.
Question #10
Gelatinase and caseinase are both examples of
A.   lipases.
B.   proteases.
C.   amylases.
D.   DNases.

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