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BIOD 171 EXAM MODULE 4 la
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True or False: Growth media is best suited for distinguishing between two similar species of bacteria.
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False. Growth media is designed to simply support (and not restrict) microbial growth.
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2. A researcher is asked to determine which of two vials contains E coli and which contains
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Salmonella. Knowing both are Gram-Negative while only one of them is capable of fermenting
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lactose, which type of media would be best suited:
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A. Growth media
B. Differential media
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C. Selective media
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D. Selective and Differential media
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B. Differential media distinguishes between two, often related, microbes.
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3. What are the requirements of a fastidious microbe?
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A fastidious microbe is an organism with complex growth requirements such that if absent itwill not grow.
Enriched medias thus contain these specific and essential nutrients required for the growth of a particular
Exam Page 2
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subset of microorganisms.
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Answer Key
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1. True or False: LB agar is classified as a selective, non-differential media.
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False. LB agar is the most basic type of agar and like LB media supports the growth ofvirtually all microbes
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without restriction.
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2. What is agar used for in microbiology?
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Exam
Agar is usedPage
to create a3
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solid, smooth surface on which microbes can grow.
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Answer Key
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1. Match the following hemolytic class with its description of activity.
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1. Alpha hemolysis
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B A. No hemolytic activity
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2. Beta hemolysis
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C B. Incomplete hemolytic activity
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BIOD 171 EXAM MODULE 4 la
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True or False: Growth media is best suited for distinguishing between two similar species of bacteria.
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False. Growth media is designed to simply support (and not restrict) microbial growth.
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sh
Sp
ne
2. A researcher is asked to determine which of two vials contains E coli and which contains
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Salmonella. Knowing both are Gram-Negative while only one of them is capable of fermenting
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lactose, which type of media would be best suited:
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A. Growth media
B. Differential media
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C. Selective media
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D. Selective and Differential media
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B. Differential media distinguishes between two, often related, microbes.
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Sp
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3. What are the requirements of a fastidious microbe?
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A fastidious microbe is an organism with complex growth requirements such that if absent itwill not grow.
Enriched medias thus contain these specific and essential nutrients required for the growth of a particular
Exam Page 2
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subset of microorganisms.
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Answer Key
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1. True or False: LB agar is classified as a selective, non-differential media.
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False. LB agar is the most basic type of agar and like LB media supports the growth ofvirtually all microbes
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without restriction.
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2. What is agar used for in microbiology?
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Exam
Agar is usedPage
to create a3
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solid, smooth surface on which microbes can grow.
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Answer Key
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Sp
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1. Match the following hemolytic class with its description of activity.
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ne
1. Alpha hemolysis
a
B A. No hemolytic activity
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2. Beta hemolysis
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C B. Incomplete hemolytic activity
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