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; Coliform
D.   Red; Non-coliform
E.   Red; Staphyloccus aureus
Question #2
What is the differential agent in MSA?
A.   Mannitol
B.   7.5% NaCl
C.   Lactose
D.   Peptone
E.   Phenol red
Question #3
Pink growth on MacConkey agar indicates the bacterium ______.
A.   Does not ferment lactose or sucrose
B.   Does not ferment lactose only
C.   Does not ferment sucrose only
D.   Is gram +
E.   Ferments lactose
F.   Ferments sucrose only
Question #4
The selective agent(s) in EMB is ________.
A.   Lactose
B.   Eosin & Methylene Blue
C.   Phenol red
D.   Agar
E.   Peptne
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.   Enterococcus
B.   Micrococcaceae & Streptococcaceae
C.   Enterobacteriaceae
D.   Coliform
Question #7
Incomplete hemolysis on blood agar is indicated by observing _____.
A.   Greening around growth
B.   Clearing around growth
C.   Production of a black precipitate
D.   No change in the medium
Question #8
On blood agar, streptolysin O expresses maximal activity under _____ conditions.
A.   Aerobic
B.   Anaerobic
C.   Facultative
D.   Microaerophilic

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