BIOD 171 Module 5 Exam 2026/2027 UPDATED
QUESTIONS WITH ANSWERS GRADED A+
• List at least 3 observations a researcher would be sure to note while assessing an
unknown microbial sample. -✓✓ 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? -✓✓ 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? -✓✓ 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? -✓✓ 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 -✓✓ 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. -✓✓ False
The Lancefield groupings are used to subdivide beta-hemolytic Strep
• Greater than 90% of all human streptococcal infections belong to:
- Group C
- Group B
- Group A
- Group D -✓✓ Group A
Group A is the causative agent behind> 90% of all strep infections
• Rheumatic fever displays ______ hemolytic activity and occurs when _______ is
left untreated.
Beta; Rheumatic fever
Alpha; Strep. Pharyngitis
Beta; Strep. Pharyngitis
Gamma; Strep. Septicemia -✓✓ Beta; Strep. Pharyngitis
QUESTIONS WITH ANSWERS GRADED A+
• List at least 3 observations a researcher would be sure to note while assessing an
unknown microbial sample. -✓✓ 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? -✓✓ 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? -✓✓ 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? -✓✓ 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 -✓✓ 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. -✓✓ False
The Lancefield groupings are used to subdivide beta-hemolytic Strep
• Greater than 90% of all human streptococcal infections belong to:
- Group C
- Group B
- Group A
- Group D -✓✓ Group A
Group A is the causative agent behind> 90% of all strep infections
• Rheumatic fever displays ______ hemolytic activity and occurs when _______ is
left untreated.
Beta; Rheumatic fever
Alpha; Strep. Pharyngitis
Beta; Strep. Pharyngitis
Gamma; Strep. Septicemia -✓✓ Beta; Strep. Pharyngitis
