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WGU D311 OA Final Exam | D311 Microbiology Objective
Assessment Final Exam Complete Questions and Correct
Answers (Verified) | Graded A+| Newest 2026/2027 l Brand
New Version!!
What is the significance of microorganisms containing a thick coat of
peptldogiywn within the cell wall? - ANSWER=Microorganisms containing a thick
coat of peptidoglycan within the cell wall are typically classified as gram-positive
bacteria.
Which microorganism can cause vaginal yeast Infections and oral thrush? -
ANSWER=Fungi
Why can It be difficult to determine the etiologic agent of a disease? -
ANSWER=Some signs and symptoms can be caused by many different etiologic
agents.
What kind of staining technique Is the acid-fast stain? - ANSWER=
A doctor prescribed antibiotics for a patient complaining of runny nose. fever. and
aches and pains. Which type of infection did the doctor suspect? - ANSWER=The
doctor likely suspected a viral infection because antibiotics are not effective
against viral infections.
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A healthcare professional is treating a patient who developed a yeast infection
after taking antibiotics. What type of medication should be prescribed to this
patient? - ANSWER=Antifungals
Which bacterial virulence factor allows a strain to resist phagocytosis, increasing
the organism's virulence? - ANSWER=Capsule production
Why is treating Haemophilus influenzae difficult? - ANSWER=The capsule is
antiphagocytic.
How do pili aid pathogens in causing disease? - ANSWER=They cause pathogens
to adhere to host cells.
Which virulence factor allows pathogens to penetrate the dermis and invade the
body? - ANSWER=Bacterial enzymes
A bacterium from a deep-sea hydrothermal vent has been cultured. Which
staining technique should be used to begin the process of species identification? -
ANSWER=Gram staining
Which aspect of a staining protocol enables dye to penetrate an endospore? -
ANSWER=Heat Why are the relationships between pathogenic microbes and their
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hosts considered parasitic? - ANSWER=The microbe benefits from the interaction
while the host is harmed.
Why are viruses considered aceilular? - ANSWER=They cannot reproduce without
a host.
What is the defining characteristic of eukaryotes? - ANSWER=They have a nucleus.
Which structure promotes motility in Proteus. Shigelia. and Salmonella species. all
of which can cause serious disease in humans? - ANSWER=Presence of flagella
Which characteristic of dracunculiasis has been pivotal to the success of its
eradication campaign? - ANSWER=Dracunculiasis has no animal reservoir.
Which type of organism would be most likely to grow on food stored in a
refrigerator or freezer? - ANSWER=A psychrophile would be most likely to grow on
food stored in a refrigerator or freezer as these microorganisms thrive in cold
temperatures.
Staphylococcus epidermldls is a member of the human resident microbiota and
considered part of the human innate immune system. S. epldermidis uses our
dead skin cells as a source of nutrients. What type of relationship between S.
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epidermidis and humans is described above? - ANSWER=The type of relationship
between Staphylococcus epidermidis and humans described above is
"Commensalism," where one organism (S. epidermidis) benefits (uses dead skin
cells) without harming the other organism (humans).
Commensalism
Why is the production of lactic acid by the resident microbe Lactobacillus
Important to human health? - ANSWER=Lactic acid is important to human health
because it inhibits the growth of pathogenic yeasts.
What does the presence of a clear area around a cell stained with India ink
indicate about the cell? - ANSWER=The cell has a capsule.
Which type of infections are prevented by proper sterilization of hospital
equipment and healthcare worker handwashing? - ANSWER=Nosocomial
infections are prevented by proper sterilization of hospital equipment and
healthcare worker handwashing.
A patient Is determined to have contracted Lyme disease after being bit by an
infected tick. What type of transmission is described in this scenario? -
ANSWER=Vector transmission is described in this scenario.
WGU D311 OA Final Exam | D311 Microbiology Objective
Assessment Final Exam Complete Questions and Correct
Answers (Verified) | Graded A+| Newest 2026/2027 l Brand
New Version!!
What is the significance of microorganisms containing a thick coat of
peptldogiywn within the cell wall? - ANSWER=Microorganisms containing a thick
coat of peptidoglycan within the cell wall are typically classified as gram-positive
bacteria.
Which microorganism can cause vaginal yeast Infections and oral thrush? -
ANSWER=Fungi
Why can It be difficult to determine the etiologic agent of a disease? -
ANSWER=Some signs and symptoms can be caused by many different etiologic
agents.
What kind of staining technique Is the acid-fast stain? - ANSWER=
A doctor prescribed antibiotics for a patient complaining of runny nose. fever. and
aches and pains. Which type of infection did the doctor suspect? - ANSWER=The
doctor likely suspected a viral infection because antibiotics are not effective
against viral infections.
,2|Page
A healthcare professional is treating a patient who developed a yeast infection
after taking antibiotics. What type of medication should be prescribed to this
patient? - ANSWER=Antifungals
Which bacterial virulence factor allows a strain to resist phagocytosis, increasing
the organism's virulence? - ANSWER=Capsule production
Why is treating Haemophilus influenzae difficult? - ANSWER=The capsule is
antiphagocytic.
How do pili aid pathogens in causing disease? - ANSWER=They cause pathogens
to adhere to host cells.
Which virulence factor allows pathogens to penetrate the dermis and invade the
body? - ANSWER=Bacterial enzymes
A bacterium from a deep-sea hydrothermal vent has been cultured. Which
staining technique should be used to begin the process of species identification? -
ANSWER=Gram staining
Which aspect of a staining protocol enables dye to penetrate an endospore? -
ANSWER=Heat Why are the relationships between pathogenic microbes and their
,3|Page
hosts considered parasitic? - ANSWER=The microbe benefits from the interaction
while the host is harmed.
Why are viruses considered aceilular? - ANSWER=They cannot reproduce without
a host.
What is the defining characteristic of eukaryotes? - ANSWER=They have a nucleus.
Which structure promotes motility in Proteus. Shigelia. and Salmonella species. all
of which can cause serious disease in humans? - ANSWER=Presence of flagella
Which characteristic of dracunculiasis has been pivotal to the success of its
eradication campaign? - ANSWER=Dracunculiasis has no animal reservoir.
Which type of organism would be most likely to grow on food stored in a
refrigerator or freezer? - ANSWER=A psychrophile would be most likely to grow on
food stored in a refrigerator or freezer as these microorganisms thrive in cold
temperatures.
Staphylococcus epidermldls is a member of the human resident microbiota and
considered part of the human innate immune system. S. epldermidis uses our
dead skin cells as a source of nutrients. What type of relationship between S.
, 4|Page
epidermidis and humans is described above? - ANSWER=The type of relationship
between Staphylococcus epidermidis and humans described above is
"Commensalism," where one organism (S. epidermidis) benefits (uses dead skin
cells) without harming the other organism (humans).
Commensalism
Why is the production of lactic acid by the resident microbe Lactobacillus
Important to human health? - ANSWER=Lactic acid is important to human health
because it inhibits the growth of pathogenic yeasts.
What does the presence of a clear area around a cell stained with India ink
indicate about the cell? - ANSWER=The cell has a capsule.
Which type of infections are prevented by proper sterilization of hospital
equipment and healthcare worker handwashing? - ANSWER=Nosocomial
infections are prevented by proper sterilization of hospital equipment and
healthcare worker handwashing.
A patient Is determined to have contracted Lyme disease after being bit by an
infected tick. What type of transmission is described in this scenario? -
ANSWER=Vector transmission is described in this scenario.
