Bio 2010 - Microbiology » Summer 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.   thermoduric
D.   psychrophilic
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.   decimal reduction time.
B.   thermal death point.
C.   thermal death time.
D.   point of saturation.
Question #3
Disinfectants are chemical compounds that reduce and inhibit the growth of microorganisms on
A.   eyes.
B.   hair.
C.   inanimate objects.
D.   skin and mucus membranes.
Question #4
Which of the following is considered non-ionizing radiation?
A.   x-ray
B.   UV
C.   gamma
Question #5
Light with wavelengths between 250-260 nM affects __________ in cells.
A.   DNA purines
B.   DNA pyrimidines
C.   protein structure
D.   RNA
Question #6
Exoenzymes
A.   are synthesized outside the cells and transported inside.
B.   are biosynthetic enzymes that join organic molecules together.
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.   nutrient gelatin
B.   skim milk
C.   spirit blue
D.   starch
Question #8
This indicator solution is used to show the presence of starch.
A.   phenol red
B.   spirit blue
C.   sodium hydroxide
D.   iodine
Question #9
A positive indication of the presence of the exoenzyme lipase is
A.   cloudiness in a TSA broth.
B.   liquefaction of agar in a nutrient gelatin tube.
C.   a dark blue halo around the streak of an organism on a spirit blue plate.
D.   a clearing of the cloudy agar on a skim milk plate.
Question #10
Gelatinase and caseinase are both examples of
A.   lipases.
B.   DNases.
C.   proteases.
D.   amylases.

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