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