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; Coliform
B.   Red; Staphyloccus aureus
C.   Yellow; Staphylococcus aureus
D.   Red; Non-coliform
E.   Yellow; Coliform
Question #2
What is the differential agent in MSA?
A.   Peptone
B.   Phenol red
C.   Lactose
D.   7.5% NaCl
E.   Mannitol
Question #3
Pink growth on MacConkey agar indicates the bacterium ______.
A.   Is gram +
B.   Does not ferment sucrose only
C.   Does not ferment lactose only
D.   Does not ferment lactose or sucrose
E.   Ferments lactose
F.   Ferments sucrose only
Question #4
The selective agent(s) in EMB is ________.
A.   Agar
B.   Phenol red
C.   Lactose
D.   Peptne
E.   Eosin & Methylene Blue
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.   Catalase
D.   Gelatinase
E.   Amylase
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.   No change in the medium
B.   Clearing around growth
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.   Facultative
C.   Anaerobic
D.   Microaerophilic

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