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

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