D311 Microbiology WGU OA Questions
With Answer 2025.
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.
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 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.
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 structure promotes motility in Proteus. Shigelia. and Salmonella species. all of
which can cause serious disease in humans? - ANSWER- Presence of flagella
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
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.
How do basic stains work? - ANSWER- The positively charged stain is attracted to the
negatively charged portion of the cell.
Which staining technique is used to distinguish bacteria based on their ability to produce
structures that can survive extreme heat stress? - ANSWER- Endospore stain
Which aspect of a staining protocol enables dye to penetrate an endospore? -
ANSWER- Heat
Why are the relationships between pathogenic microbes and their hosts considered
parasitic? - ANSWER- The microbe benefits from the interaction while the host is
harmed.
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. 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.
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.
With Answer 2025.
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.
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 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.
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 structure promotes motility in Proteus. Shigelia. and Salmonella species. all of
which can cause serious disease in humans? - ANSWER- Presence of flagella
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
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.
How do basic stains work? - ANSWER- The positively charged stain is attracted to the
negatively charged portion of the cell.
Which staining technique is used to distinguish bacteria based on their ability to produce
structures that can survive extreme heat stress? - ANSWER- Endospore stain
Which aspect of a staining protocol enables dye to penetrate an endospore? -
ANSWER- Heat
Why are the relationships between pathogenic microbes and their hosts considered
parasitic? - ANSWER- The microbe benefits from the interaction while the host is
harmed.
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. 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.
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.
