WGU OA D311: Microbiology 2026
QUESTIONS AND VERIFIED CORRECT
ANSWERS GRADED A+ [LATEST 2026-
2027] 100% GUARANTEED PASS
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. epidermidis and humans is described above? -
CORRECT 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? - CORRECT ANSWER-Lactic acid is important to human health because it inhibits the
growth of pathogenic yeasts.
Which type of infections are prevented by proper sterilization of hospital equipment and
healthcare worker handwashing? - CORRECT 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? - CORRECT ANSWER-Vector
transmission is described in this scenario.
Which is a description of vehicle transmission? - CORRECT ANSWER-A person drinks untreated
water on vacation and later has diarrhea and nausea is a description of vehicle transmission.
, Which organism type contains species that perform adhesion through the unique use of its
flagella to move out fluid from under a large adhesive disc, resulting in lower pressure to adhere
to the intestinal lining? - CORRECT ANSWER-Protozoa
A patient presents to the emergency department with high fever. difficulty breathing. vomiting,
coughing up blood. and severe chest pain when inhaling. Which pathogen would the provider
suspect? - CORRECT ANSWER-Bacillus anthracis
Which activity of the complement system would be useful against an infection caused by a
gram-negative bacterium? - CORRECT ANSWER-Membrane attack complex
Which body system is protected by the ciliary escalator? - CORRECT ANSWER-Respiratory
What is the role of global public health organizations in eradication of diseases, like polio? -
CORRECT ANSWER-Organize vaccination campaigns and programs
Malaria cases are routinely found in certain areas of the world but are not seen In other areas.
How would malaria be described in those areas where it is found? - CORRECT ANSWER-Endemic
A hospital notices an increase in patients being admitted with gastrointestinal symptoms and
dehydration over a two-week period. An epidemiological analysis reveals that the cause is the
same pathogen, but that none of the hospitalized individuals were ever in the same location at
the same time. What is an explanation for this analysis? - CORRECT ANSWER-These individuals
all consumed contaminated food from a common manufacturing source.
Which action is an innate physical defense? - CORRECT ANSWER-Mucous secretions trapping
and removing microbes from the respiratory tract.
Which vaccine type would be effective against an organism that can produce a capsule? -
CORRECT ANSWER-Conjugate
QUESTIONS AND VERIFIED CORRECT
ANSWERS GRADED A+ [LATEST 2026-
2027] 100% GUARANTEED PASS
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. epidermidis and humans is described above? -
CORRECT 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? - CORRECT ANSWER-Lactic acid is important to human health because it inhibits the
growth of pathogenic yeasts.
Which type of infections are prevented by proper sterilization of hospital equipment and
healthcare worker handwashing? - CORRECT 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? - CORRECT ANSWER-Vector
transmission is described in this scenario.
Which is a description of vehicle transmission? - CORRECT ANSWER-A person drinks untreated
water on vacation and later has diarrhea and nausea is a description of vehicle transmission.
, Which organism type contains species that perform adhesion through the unique use of its
flagella to move out fluid from under a large adhesive disc, resulting in lower pressure to adhere
to the intestinal lining? - CORRECT ANSWER-Protozoa
A patient presents to the emergency department with high fever. difficulty breathing. vomiting,
coughing up blood. and severe chest pain when inhaling. Which pathogen would the provider
suspect? - CORRECT ANSWER-Bacillus anthracis
Which activity of the complement system would be useful against an infection caused by a
gram-negative bacterium? - CORRECT ANSWER-Membrane attack complex
Which body system is protected by the ciliary escalator? - CORRECT ANSWER-Respiratory
What is the role of global public health organizations in eradication of diseases, like polio? -
CORRECT ANSWER-Organize vaccination campaigns and programs
Malaria cases are routinely found in certain areas of the world but are not seen In other areas.
How would malaria be described in those areas where it is found? - CORRECT ANSWER-Endemic
A hospital notices an increase in patients being admitted with gastrointestinal symptoms and
dehydration over a two-week period. An epidemiological analysis reveals that the cause is the
same pathogen, but that none of the hospitalized individuals were ever in the same location at
the same time. What is an explanation for this analysis? - CORRECT ANSWER-These individuals
all consumed contaminated food from a common manufacturing source.
Which action is an innate physical defense? - CORRECT ANSWER-Mucous secretions trapping
and removing microbes from the respiratory tract.
Which vaccine type would be effective against an organism that can produce a capsule? -
CORRECT ANSWER-Conjugate
