D311: Microbiology WGU OA (2025) comprehensive
questions and verified answers (detailed &
elaborated) ACTUAL EXAM 2025 TESTS!!
What is the significance of microorganisms containing a thick coat of peptidoglycan within
the cell wall?
Microorganisms containing a thick coat of peptidoglycan within the cell wall are typically
classified as gram-positive bacteria.
Why are viruses considered aceilular?
They cannot reproduce without a host.
What is the defining characteristic of eukaryotes?
They have a nucleus.
Which microorganism can cause vaginal yeast Infections and oral thrush?
Fungi
Why can It be difficult to determine the etiologic agent of a disease?
Some signs and symptoms can be caused by many different etiologic agents.
What kind of staining technique Is the acid-fast stain?
Differential Stain
A doctor prescribed antibiotics for a patient complaining of runny nose. fever. and aches and
pains. Which type of infection did the doctor suspect?
, The doctor likely suspected a bacterial 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?
Antifungals
Which structure promotes motility in Proteus. Shigelia. and Salmonella species. all of which
can cause serious disease in humans?
Presence of flagella
Which bacterial virulence factor allows a strain to resist phagocytosis, increasing the
organism's virulence?
Capsule production
Why is treating Haemophilus influenzae difficult?
The capsule is antiphagocytic.
How do pili aid pathogens in causing disease?
They cause pathogens to adhere to host cells.
Which virulence factor allows pathogens to penetrate the dermis and invade the body?
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?
Gram staining
What does the presence of a clear area around a cell stained with India ink indicate about the
cell?
The cell has a capsule.
questions and verified answers (detailed &
elaborated) ACTUAL EXAM 2025 TESTS!!
What is the significance of microorganisms containing a thick coat of peptidoglycan within
the cell wall?
Microorganisms containing a thick coat of peptidoglycan within the cell wall are typically
classified as gram-positive bacteria.
Why are viruses considered aceilular?
They cannot reproduce without a host.
What is the defining characteristic of eukaryotes?
They have a nucleus.
Which microorganism can cause vaginal yeast Infections and oral thrush?
Fungi
Why can It be difficult to determine the etiologic agent of a disease?
Some signs and symptoms can be caused by many different etiologic agents.
What kind of staining technique Is the acid-fast stain?
Differential Stain
A doctor prescribed antibiotics for a patient complaining of runny nose. fever. and aches and
pains. Which type of infection did the doctor suspect?
, The doctor likely suspected a bacterial 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?
Antifungals
Which structure promotes motility in Proteus. Shigelia. and Salmonella species. all of which
can cause serious disease in humans?
Presence of flagella
Which bacterial virulence factor allows a strain to resist phagocytosis, increasing the
organism's virulence?
Capsule production
Why is treating Haemophilus influenzae difficult?
The capsule is antiphagocytic.
How do pili aid pathogens in causing disease?
They cause pathogens to adhere to host cells.
Which virulence factor allows pathogens to penetrate the dermis and invade the body?
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?
Gram staining
What does the presence of a clear area around a cell stained with India ink indicate about the
cell?
The cell has a capsule.
