Microbiology 020 - General Microbiology » Winter 2022 » Lab Quiz 4-Selective & 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; Coliform
D.   Red; Non-coliform
E.   Yellow; Staphylococcus aureus
Question #2
On an MSA plate, if the bacterium ferments mannitol, _____ is produced, and the indicator dye turns _____.
A.   Acid; red
B.   Base; red
C.   Water; orange
D.   Base; yellow
E.   Acid; yellow
Question #3
Is MacConkey agar selective, differential, both, or neither.
A.   Neither
B.   Selective only
C.   Selective & Differential
D.   Differential only
Question #4
When bacteria grown on EMB and produce a black color with a metallic sheen, the presumptive ID is ______.
A.   Gram +
B.   Non-coliform
C.   Probable coliform
D.   Staphylococcus
E.   Possible coliform
Question #5
Is EMB selective, differential, both, or neither?
A.   Selective only
B.   Differential only
C.   Selective & Differential
D.   Neither
Question #6
A transparent halo surrounding bacterial growth on a starch hydrolysis plate indicates that the bacterial species is _____.
A.   Is a strict aerobe
B.   Ferments lactose
C.   Is a facultative halophile
D.   Amylase +
Question #7
Is the catalase test selective, differential, both, or neither?
A.   Differential only
B.   Selective only
C.   Selective & Differential
D.   None
Question #8
A positive oxidase test will appear _____.
A.   Clear, between 0 and 60 seconds after adding the reagent
B.   Blue, between 0 & 60 seconds after adding the reagent
C.   No bubbles upon adding the reagent
D.   Blue, 60 seconds after adding the reagent
E.   Bubbly upon adding the reagent
Question #9
On blood agar, streptolysin O expresses maximal activity under _____ conditions.
A.   Anaerobic
B.   Microaerophilic
C.   Facultative
D.   Aerobic
Question #10
Is blood agar selective, differential, both, or neither?
A.   Selective & Differential
B.   Neither
C.   Selective only
D.   Differential only

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