©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
Howard MIC224 final practical Exam
Questions With Correct Answers.
What does MSA stand for? - answer✔mannitol salt agar
What is the substrate in MSA? - answer✔mannitol
What is the indicatior in MSA? - answer✔phenol red
What's the selective agent in MSA? - answer✔NaCl
What color would a positive reaction be on MSA? - answer✔yellow (s. aureus)
What color would a negative reaction be on MSA? - answer✔red (s. epidermis)
What does GEL stand for? - answer✔gelatin agar
Is MSA selective or differential? - answer✔selective
What is the substrate in GEL? - answer✔gelatin
What is the indicator in GEL? - answer✔HCl
What is the selective agent in GEL? - answer✔none
What does a positive reaction (zone) mean in GEL plates? - answer✔the organism produces
gelatinase
What does STA stand for? - answer✔starch agar
What is the substrate in STA? - answer✔starch
What is the indicator in STA? - answer✔iodine
What is the selective agent in STA? - answer✔none
Is STA selective or differential? - answer✔differential
What does a positive reaction to STA mean? - answer✔the organism produces amylase
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, ©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
What does SBA stand for? - answer✔sheep's blood agar
What is the substrate in SBA? - answer✔blood
What is the indicator in SBA? - answer✔none
What is the selective agent in SBA? - answer✔none
Is SBA selective or differential? - answer✔differential
What does alpha hemolysis mean? - answer✔green, incomplete clearing
What does beta hemolysis mean? - answer✔complete clearing, zone
What does gamma hemolysis mean? - answer✔no clearing, nothing
What is the selective agent in PEA? - answer✔phenol alcohol
What does PEA select for? - answer✔Gm+
What will you see with a pos rxn to PEA? - answer✔growth
What is the substrate in EMB? - answer✔lactose
What is the indicator in EMB? - answer✔methyl blue
Is PEA selective or differential? - answer✔selective
What does PEA stand for? - answer✔Phenyl Ethyl Alcohol
What does EMB stand for? - answer✔Eosin Methylene Blue
Is EMB selective or differential? - answer✔both
What is the indicator in EMB? - answer✔methyl blue
Whats the selective agent in EMB? - answer✔methyl blue/eosin
EMB selects for what? - answer✔Gm-
What color shows a lactose fermenting bacteria on an EMB plate? - answer✔purple
What's the only exception to the postive EMB reaction being purple? - answer✔e. coli ferments
lactose, but will be a shiny, metallic, green
What does MAC stand for? - answer✔Macconkey Agar
2|Page
11/16/2024 10:16 AM
Howard MIC224 final practical Exam
Questions With Correct Answers.
What does MSA stand for? - answer✔mannitol salt agar
What is the substrate in MSA? - answer✔mannitol
What is the indicatior in MSA? - answer✔phenol red
What's the selective agent in MSA? - answer✔NaCl
What color would a positive reaction be on MSA? - answer✔yellow (s. aureus)
What color would a negative reaction be on MSA? - answer✔red (s. epidermis)
What does GEL stand for? - answer✔gelatin agar
Is MSA selective or differential? - answer✔selective
What is the substrate in GEL? - answer✔gelatin
What is the indicator in GEL? - answer✔HCl
What is the selective agent in GEL? - answer✔none
What does a positive reaction (zone) mean in GEL plates? - answer✔the organism produces
gelatinase
What does STA stand for? - answer✔starch agar
What is the substrate in STA? - answer✔starch
What is the indicator in STA? - answer✔iodine
What is the selective agent in STA? - answer✔none
Is STA selective or differential? - answer✔differential
What does a positive reaction to STA mean? - answer✔the organism produces amylase
1|Page
, ©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
What does SBA stand for? - answer✔sheep's blood agar
What is the substrate in SBA? - answer✔blood
What is the indicator in SBA? - answer✔none
What is the selective agent in SBA? - answer✔none
Is SBA selective or differential? - answer✔differential
What does alpha hemolysis mean? - answer✔green, incomplete clearing
What does beta hemolysis mean? - answer✔complete clearing, zone
What does gamma hemolysis mean? - answer✔no clearing, nothing
What is the selective agent in PEA? - answer✔phenol alcohol
What does PEA select for? - answer✔Gm+
What will you see with a pos rxn to PEA? - answer✔growth
What is the substrate in EMB? - answer✔lactose
What is the indicator in EMB? - answer✔methyl blue
Is PEA selective or differential? - answer✔selective
What does PEA stand for? - answer✔Phenyl Ethyl Alcohol
What does EMB stand for? - answer✔Eosin Methylene Blue
Is EMB selective or differential? - answer✔both
What is the indicator in EMB? - answer✔methyl blue
Whats the selective agent in EMB? - answer✔methyl blue/eosin
EMB selects for what? - answer✔Gm-
What color shows a lactose fermenting bacteria on an EMB plate? - answer✔purple
What's the only exception to the postive EMB reaction being purple? - answer✔e. coli ferments
lactose, but will be a shiny, metallic, green
What does MAC stand for? - answer✔Macconkey Agar
2|Page
