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D311: Microbiology WGU OA Questions With
CORRECT ANSWER s.
Question 1: What is a characteristic of rhizospheres?
CORRECT ANSWER : The rhizosphere is where plants release
organic compounds that can be metabolized by microbes into soil.
Question 2: Which environment would contain microbes that are
psychrophilic?
CORRECT ANSWER : Glaciers
Question 3: What is the role of nematodes in soil?
CORRECT ANSWER : They photosynthesize and fix nitrogen.
Question 4: Which eukaryote is responsible for producing
antibiotics to ward off bacterial competitors?
CORRECT ANSWER : Fungi
Question 5: Which symbiotic relationship is an example of
mutualism?
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CORRECT ANSWER : The relationship between humans and
the Escherichia coli colonizing the human gut
Question 6: Which type of symbiotic relationship exists between
the Escherichia coli (E. coli) that inhabit the human gut and the humans who utilize the vitamin K produced by E. coli?
CORRECT ANSWER : Mutualism
Question 7: Which description of resident microbiota is true?
CORRECT ANSWER : Resident microbiota constantly live on
the human body.
Question 8: Which relationship is exhibited by intestinal
Escherichia coli and their human host?
CORRECT ANSWER : Mutualism
Question 9: Which type of disease is transmitted from animals
to humans?
CORRECT ANSWER : Zoonotic diseases
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Question 10: Which type of disease is acquired in hospital
settings?
CORRECT ANSWER : Nosocomial diseases
Question 11: Which portal of exit can expel the most viral
particles?
CORRECT ANSWER : Respiratory
Question 12: Which type of disease is sickle cell anemia?
CORRECT ANSWER : Noninfectious
Question 13: Which type of transmission occurs when
tuberculosis is spread through small particles expelled by a cough?
CORRECT ANSWER : Droplet transmission
Question 14: Which type of transmission occurs when
pathogens are spread from mother to child during breastfeeding?
CORRECT ANSWER : Vertical direct contact transmission
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Question 15: Which type of transmission occurs when an
arthropod carries a viral pathogen inside of its body?
CORRECT ANSWER : Biological vector transmission
Question 16: Which type of transmission occurs through contact
with a fomite?
CORRECT ANSWER : Indirect contact transmission
Question 17: Which infected host would be considered a passive
carrier?
CORRECT ANSWER : A healthcare professional who does not
wash their hands after seeing an infected patient
Question 18: How is Giardia lamblia, the causative agent of
giardiasis, transmitted?
CORRECT ANSWER : Contaminated food or water
Question 19: Which organism is the definitive host of
Toxoplasma gondii?