WGU D311 Microbiology with Lab Exam |
Questions and Verified Answers Latest
2025/2026
Which pair of enzymes are produced by some bacteria that causes the
clotting of blood to protect the bacteria in the bloodstream, then a
digestion of the clots to allow the bacteria to spread?
- Correct Answer - Coagulase and kinase
How does coinfection of a single cell by multiple strains of a virus
increase it's pathogenicity? - Correct Answer - Coinfection provides the
opportunity for an antigenic shift.
Canned food is heated and sealed in sterile containers to provide a
longer shelf life and prevent spoilage. Improper canning results in the
growth of microorganisms, which may result in food containers that swell
and explode.
Which staining technique can be used to identify these microorganisms?
- Correct Answer - Endospore staining
A student in a lab has just completed an endospore stain of Bacillus
anthracis and realized that heat was not applied during the staining
technique.
What will the student see upon microscopic examination of the slide?
- Correct Answer - Pink vegetative cells with clear round areas.
, Which organism type does a conjugate vaccine target?
- Correct Answer - Capsule-forming
A pregnant person has received all of her childhood immunizations,
including for pertussis, but has chosen not to receive boosters while
pregnant or to immunize her child once it is born.
What will happen to her child if exposed to pertussis at five years old.
- Correct Answer - The child's immune system will need to fight the
infection.
An infection by a pathogen that occurs several years after the first elicits
a faster response from lymphocytes. Why is the response by
lymphocytes to a second infection so much faster than the first?
- Correct Answer - Lymphocytes produce memory cells during the first
infection, providing active immunity.
A physician is given a vaginal swab in order to test for post-antibiotic
vaginal infection.
Which microscopic technique would identify opportunistic fungal
pathogen?
- Correct Answer - Wet mount stain
A technician has just performed a Gram stain but forgot to add the
safranin.
What is the likely result of this when viewed microscopically?
- Correct Answer - Gram-negative organisms can not be seen under the
microscope.
Questions and Verified Answers Latest
2025/2026
Which pair of enzymes are produced by some bacteria that causes the
clotting of blood to protect the bacteria in the bloodstream, then a
digestion of the clots to allow the bacteria to spread?
- Correct Answer - Coagulase and kinase
How does coinfection of a single cell by multiple strains of a virus
increase it's pathogenicity? - Correct Answer - Coinfection provides the
opportunity for an antigenic shift.
Canned food is heated and sealed in sterile containers to provide a
longer shelf life and prevent spoilage. Improper canning results in the
growth of microorganisms, which may result in food containers that swell
and explode.
Which staining technique can be used to identify these microorganisms?
- Correct Answer - Endospore staining
A student in a lab has just completed an endospore stain of Bacillus
anthracis and realized that heat was not applied during the staining
technique.
What will the student see upon microscopic examination of the slide?
- Correct Answer - Pink vegetative cells with clear round areas.
, Which organism type does a conjugate vaccine target?
- Correct Answer - Capsule-forming
A pregnant person has received all of her childhood immunizations,
including for pertussis, but has chosen not to receive boosters while
pregnant or to immunize her child once it is born.
What will happen to her child if exposed to pertussis at five years old.
- Correct Answer - The child's immune system will need to fight the
infection.
An infection by a pathogen that occurs several years after the first elicits
a faster response from lymphocytes. Why is the response by
lymphocytes to a second infection so much faster than the first?
- Correct Answer - Lymphocytes produce memory cells during the first
infection, providing active immunity.
A physician is given a vaginal swab in order to test for post-antibiotic
vaginal infection.
Which microscopic technique would identify opportunistic fungal
pathogen?
- Correct Answer - Wet mount stain
A technician has just performed a Gram stain but forgot to add the
safranin.
What is the likely result of this when viewed microscopically?
- Correct Answer - Gram-negative organisms can not be seen under the
microscope.
