D311 Microbiology OA Exam 2026 – 100+ Verified
Questions & Answers | Vaccines, Pathogens, Staining,
Immunity | WGU
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 acellular?
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. Shigella. 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
Questions & Answers | Vaccines, Pathogens, Staining,
Immunity | WGU
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 acellular?
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. Shigella. 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
