BIOD 171 MODULE 5 ESSENTIAL
MICROBIOLOGY COMPREHENSIVE STUDY
SCRIPT VERIFIED QUESTIONS ANSWERS
ACCURATE SOLUTIONS PACK
●● List at least 3 observations a researcher would be sure to note while
assessing an unknown microbial sample.
Answer: 1. size and shape
2. gram status
3. any observable motility
●● While observing an unknown sample of limited amounts, a
researcher must determine the following observations: (1) the presence
of any motility and (2) its Gram status using the same sample—the
liquid sample cannot be divided. Which would you determine first and
why?
Answer: You would need to determine the motility first and then the
Gram status. Motility requires a wet mount and Gram staining requires
heat fixing the sample. If you perform a Gram stain first the heat fixation
would kill the organism, making it impossible to observe motility.
●● A facultative anaerobe is a microorganism capable of growth under
what conditions?
, Answer: It is capable of growth under both anaerobic and aerobic
conditions
●● As Streptococcus is catalase negative would it thrive or die in the
presence of peroxides? Why?
Answer: It would die. Because it is catalase negative it wouldn't be able
to breakdown peroxides.
●● Streptococcus is most often streaked onto:
- Chocolate agar
- EMB agar
- Blood agar
- Spirit Blue agar
Answer: Blood agar
Strep is often cultured on Blood agar plates to determine its hemolytic
properties, which aids in the classification (and differentiation) process.
●● True or False. The Lancefield groups are used to subdivide antigenic
groups of gamma-hemolytic Streptococcus.
Answer: False
The Lancefield groupings are used to subdivide beta-hemolytic Strep
MICROBIOLOGY COMPREHENSIVE STUDY
SCRIPT VERIFIED QUESTIONS ANSWERS
ACCURATE SOLUTIONS PACK
●● List at least 3 observations a researcher would be sure to note while
assessing an unknown microbial sample.
Answer: 1. size and shape
2. gram status
3. any observable motility
●● While observing an unknown sample of limited amounts, a
researcher must determine the following observations: (1) the presence
of any motility and (2) its Gram status using the same sample—the
liquid sample cannot be divided. Which would you determine first and
why?
Answer: You would need to determine the motility first and then the
Gram status. Motility requires a wet mount and Gram staining requires
heat fixing the sample. If you perform a Gram stain first the heat fixation
would kill the organism, making it impossible to observe motility.
●● A facultative anaerobe is a microorganism capable of growth under
what conditions?
, Answer: It is capable of growth under both anaerobic and aerobic
conditions
●● As Streptococcus is catalase negative would it thrive or die in the
presence of peroxides? Why?
Answer: It would die. Because it is catalase negative it wouldn't be able
to breakdown peroxides.
●● Streptococcus is most often streaked onto:
- Chocolate agar
- EMB agar
- Blood agar
- Spirit Blue agar
Answer: Blood agar
Strep is often cultured on Blood agar plates to determine its hemolytic
properties, which aids in the classification (and differentiation) process.
●● True or False. The Lancefield groups are used to subdivide antigenic
groups of gamma-hemolytic Streptococcus.
Answer: False
The Lancefield groupings are used to subdivide beta-hemolytic Strep
