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