Microbiology 020 - General Microbiology » Fall 2021 » Lab Quiz 4 Selective and Differential Media
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Question #1
After inoculation, if MSA turns ______, the presumptive ID is ______.
A.
Red; Non-coliform
B.
Red; Coliform
C.
Red; Staphyloccus aureus
D.
Yellow; Staphylococcus aureus
E.
Yellow; Coliform
Question #2
What is the differential agent in MSA?
A.
7.5% NaCl
B.
Mannitol
C.
Lactose
D.
Peptone
E.
Phenol red
Question #3
Pink growth on MacConkey agar indicates the bacterium ______.
A.
Does not ferment sucrose only
B.
Ferments lactose
C.
Does not ferment lactose only
D.
Is gram +
E.
Ferments sucrose only
F.
Does not ferment lactose or sucrose
Question #4
The selective agent(s) in EMB is ________.
A.
Agar
B.
Peptne
C.
Eosin & Methylene Blue
D.
Phenol red
E.
Lactose
Question #5
If a clearing is present on an inoculated starch hydrolysis plate, the bacterium makes the enzyme _____.
A.
Cytochrome C oxidase
B.
Catalase
C.
Amylase
D.
Gelatinase
E.
Superoxide dismutase
Question #6
The catalase is most often used to differentiate ________ species.
A.
Micrococcaceae & Streptococcaceae
B.
Enterobacteriaceae
C.
Enterococcus
D.
Coliform
Question #7
Incomplete hemolysis on blood agar is indicated by observing _____.
A.
Clearing around growth
B.
No change in the medium
C.
Production of a black precipitate
D.
Greening around growth
Question #8
On blood agar, streptolysin O expresses maximal activity under _____ conditions.
A.
Aerobic
B.
Anaerobic
C.
Facultative
D.
Microaerophilic
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