BIOD 171 – Module 4 Exam Prep
Question 1:
True or False: Growth media is best suited for distinguishing between two
similar species of bacteria.
False
True or False: Differential media is best suited for distinguishing between
two similar species of bacteria.
True
Question 2:
A researcher is asked to determine which of two vials contains E coli and
which contains salmonella. Knowing both are Gram-negative while only one
of them is capable of
fermenting lactose, which type of media would be best suited?
Differential media
A researcher is asked to determine if a sample contains Neisseria
meningitides. Knowing Neisseria meningitides is slow growing and other
foreign microbes may also be present in the culture, which type of media
would be best suited?
Selective media
Question 3:
What are the requirements of a fastidious microbe?
A fastidious microbe is an organism that has complicated
growth needs, and if those needs aren’t met, it won’t be able
to grow. Enriched media provide the specific and vital
nutrients necessary for the growth of certain types of
microorganisms.
Question 4:
True or False: LB agar is classified as a non-selective, non-differential
media.
, BIOD 171 – Module 4 Exam Prep
True
True or False: LB agar is classified as a selective, non-differential media.
False
Question 5:
What is agar used for in microbiology?
Agar is used to create a solid, smooth surface on which
microbes can grow.
The polysaccharide-based hardening agent added to LB media to produce
LB agar is derived from what?
Seaweed extract
Question 6:
Blood agar is which type of medium? Select all that apply.
Selective and Differential
Enriched
Differential
Selective
Question 7:
Match the following hemolytic class with its description of activity:
1. Alpha hemolysis: B. Greenish-brown color
2. Beta hemolysis: C. Distinct zone of clearing
3. Gamma hemolysis: A. No change
Question 8:
Columbia CNA agar is used to isolate:
• Gram-Positive
• Gram-Positive and Gram-Negative
• Mycobacteria
• Gram-Negative
Question 1:
True or False: Growth media is best suited for distinguishing between two
similar species of bacteria.
False
True or False: Differential media is best suited for distinguishing between
two similar species of bacteria.
True
Question 2:
A researcher is asked to determine which of two vials contains E coli and
which contains salmonella. Knowing both are Gram-negative while only one
of them is capable of
fermenting lactose, which type of media would be best suited?
Differential media
A researcher is asked to determine if a sample contains Neisseria
meningitides. Knowing Neisseria meningitides is slow growing and other
foreign microbes may also be present in the culture, which type of media
would be best suited?
Selective media
Question 3:
What are the requirements of a fastidious microbe?
A fastidious microbe is an organism that has complicated
growth needs, and if those needs aren’t met, it won’t be able
to grow. Enriched media provide the specific and vital
nutrients necessary for the growth of certain types of
microorganisms.
Question 4:
True or False: LB agar is classified as a non-selective, non-differential
media.
, BIOD 171 – Module 4 Exam Prep
True
True or False: LB agar is classified as a selective, non-differential media.
False
Question 5:
What is agar used for in microbiology?
Agar is used to create a solid, smooth surface on which
microbes can grow.
The polysaccharide-based hardening agent added to LB media to produce
LB agar is derived from what?
Seaweed extract
Question 6:
Blood agar is which type of medium? Select all that apply.
Selective and Differential
Enriched
Differential
Selective
Question 7:
Match the following hemolytic class with its description of activity:
1. Alpha hemolysis: B. Greenish-brown color
2. Beta hemolysis: C. Distinct zone of clearing
3. Gamma hemolysis: A. No change
Question 8:
Columbia CNA agar is used to isolate:
• Gram-Positive
• Gram-Positive and Gram-Negative
• Mycobacteria
• Gram-Negative
