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.   psychrophilic
B.   resistant
C.   mesophilic
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.   point of saturation.
B.   thermal death point.
C.   decimal reduction time.
D.   thermal death time.
Question #3
Disinfectants are chemical compounds that reduce and inhibit the growth of microorganisms on
A.   eyes.
B.   hair.
C.   skin and mucus membranes.
D.   inanimate objects.
Question #4
Which of the following is considered non-ionizing radiation?
A.   x-ray
B.   gamma
C.   UV
Question #5
Light with wavelengths between 250-260 nM affects __________ in cells.
A.   protein structure
B.   DNA purines
C.   RNA
D.   DNA pyrimidines
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.   starch
B.   nutrient gelatin
C.   spirit blue
D.   skim milk
Question #8
This indicator solution is used to show the presence of starch.
A.   sodium hydroxide
B.   iodine
C.   phenol red
D.   spirit blue
Question #9
A positive indication of the presence of the exoenzyme lipase is
A.   liquefaction of agar in a nutrient gelatin tube.
B.   a dark blue halo around the streak of an organism on a spirit blue plate.
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.   proteases.
B.   lipases.
C.   DNases.
D.   amylases.

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