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.   thermoduric
C.   resistant
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.   point of saturation.
D.   thermal death time.
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.   x-ray
B.   gamma
C.   UV
Question #5
Light with wavelengths between 250-260 nM affects __________ in cells.
A.   protein structure
B.   RNA
C.   DNA pyrimidines
D.   DNA purines
Question #6
Exoenzymes
A.   are synthesized inside the cell and transported outside.
B.   are only produced by eukaryotic cells.
C.   are biosynthetic enzymes that join organic molecules together.
D.   are synthesized outside the cells and transported inside.
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.   iodine
B.   spirit blue
C.   phenol red
D.   sodium hydroxide
Question #9
A positive indication of the presence of the exoenzyme lipase is
A.   liquefaction of agar in a nutrient gelatin tube.
B.   a clearing of the cloudy agar on a skim milk plate.
C.   a dark blue halo around the streak of an organism on a spirit blue plate.
D.   cloudiness in a TSA broth.
Question #10
Gelatinase and caseinase are both examples of
A.   DNases.
B.   amylases.
C.   proteases.
D.   lipases.

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