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

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