Bio 2010 - Microbiology » Summer 2023 » Lab Quiz 3

Need help with your exam preparation?

Existing Quiz Clients Login here
Question #1
Organisms that can withstand high temperatures are said to be
A.   psychrophilic
B.   mesophilic
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.   decimal reduction time.
C.   thermal death point.
D.   point of saturation.
Question #3
Disinfectants are chemical compounds that reduce and inhibit the growth of microorganisms on
A.   inanimate objects.
B.   skin and mucus membranes.
C.   hair.
D.   eyes.
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.   DNA pyrimidines
B.   RNA
C.   protein structure
D.   DNA purines
Question #6
Exoenzymes
A.   are only produced by eukaryotic cells.
B.   are synthesized inside the cell and transported outside.
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.   spirit blue
B.   nutrient gelatin
C.   skim milk
D.   starch
Question #8
This indicator solution is used to show the presence of starch.
A.   phenol red
B.   sodium hydroxide
C.   iodine
D.   spirit blue
Question #9
A positive indication of the presence of the exoenzyme lipase is
A.   cloudiness in a TSA broth.
B.   a clearing of the cloudy agar on a skim milk plate.
C.   liquefaction of agar in a nutrient gelatin tube.
D.   a dark blue halo around the streak of an organism on a spirit blue plate.
Question #10
Gelatinase and caseinase are both examples of
A.   DNases.
B.   proteases.
C.   amylases.
D.   lipases.

Need help with your exam preparation?

Existing Quiz Clients Login here