Bio 2010 - Microbiology » Spring 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.   point of saturation.
B.   thermal death point.
C.   thermal death time.
D.   decimal reduction time.
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.   UV
C.   gamma
Question #5
Light with wavelengths between 250-260 nM affects __________ in cells.
A.   protein structure
B.   RNA
C.   DNA purines
D.   DNA pyrimidines
Question #6
Exoenzymes
A.   are only produced by eukaryotic cells.
B.   are biosynthetic enzymes that join organic molecules together.
C.   are synthesized inside the cell and transported outside.
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.   starch
C.   skim milk
D.   nutrient gelatin
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.   a dark blue halo around the streak of an organism on a spirit blue plate.
C.   a clearing of the cloudy agar on a skim milk plate.
D.   liquefaction of agar in a nutrient gelatin tube.
Question #10
Gelatinase and caseinase are both examples of
A.   lipases.
B.   proteases.
C.   amylases.
D.   DNases.

Need help with your exam preparation?

Existing Quiz Clients Login here