D311: Microbiology WGU OA UPDATED
ACTUAL Questions and CORRECT
Answers
What is the significance of microorganisms containing a thick coat of peptldogiywn within the
cell wall? - CORRECT ANSWER Microorganisms containing a thick coat of
peptidoglycan within the cell wall are typically classified as gram-positive bacteria.
Why are viruses considered aceilular? - CORRECT ANSWER They cannot reproduce
without a host.
What is the defining characteristic of eukaryotes? - CORRECT ANSWER They have a
nucleus.
Which microorganism can cause vaginal yeast Infections and oral thrush? - CORRECT
ANSWER Fungi
Why can It be difficult to determine the etiologic agent of a disease? - CORRECT
ANSWER Some signs and symptoms can be caused by many different etiologic agents.
What kind of staining technique Is the acid-fast stain? - CORRECT 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? - CORRECT 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? - CORRECT
ANSWER Antifungals
, Which structure promotes motility in Proteus. Shigelia. and Salmonella species. all of which can
cause serious disease in humans? - CORRECT ANSWER Presence of flagella
Which bacterial virulence factor allows a strain to resist phagocytosis, increasing the organism's
virulence? - CORRECT ANSWER Capsule production
Why is treating Haemophilus influenzae difficult? - CORRECT ANSWER The capsule is
antiphagocytic.
How do pili aid pathogens in causing disease? - CORRECT ANSWER They cause
pathogens to adhere to host cells.
Which virulence factor allows pathogens to penetrate the dermis and invade the body? -
CORRECT 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? - CORRECT
ANSWER Gram staining
What does the presence of a clear area around a cell stained with India ink indicate about the
cell? - CORRECT ANSWER The cell has a capsule.
How do basic stains work? - CORRECT 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? - CORRECT ANSWER Endospore stain
Which aspect of a staining protocol enables dye to penetrate an endospore? - CORRECT
ANSWER Heat
ACTUAL Questions and CORRECT
Answers
What is the significance of microorganisms containing a thick coat of peptldogiywn within the
cell wall? - CORRECT ANSWER Microorganisms containing a thick coat of
peptidoglycan within the cell wall are typically classified as gram-positive bacteria.
Why are viruses considered aceilular? - CORRECT ANSWER They cannot reproduce
without a host.
What is the defining characteristic of eukaryotes? - CORRECT ANSWER They have a
nucleus.
Which microorganism can cause vaginal yeast Infections and oral thrush? - CORRECT
ANSWER Fungi
Why can It be difficult to determine the etiologic agent of a disease? - CORRECT
ANSWER Some signs and symptoms can be caused by many different etiologic agents.
What kind of staining technique Is the acid-fast stain? - CORRECT 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? - CORRECT 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? - CORRECT
ANSWER Antifungals
, Which structure promotes motility in Proteus. Shigelia. and Salmonella species. all of which can
cause serious disease in humans? - CORRECT ANSWER Presence of flagella
Which bacterial virulence factor allows a strain to resist phagocytosis, increasing the organism's
virulence? - CORRECT ANSWER Capsule production
Why is treating Haemophilus influenzae difficult? - CORRECT ANSWER The capsule is
antiphagocytic.
How do pili aid pathogens in causing disease? - CORRECT ANSWER They cause
pathogens to adhere to host cells.
Which virulence factor allows pathogens to penetrate the dermis and invade the body? -
CORRECT 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? - CORRECT
ANSWER Gram staining
What does the presence of a clear area around a cell stained with India ink indicate about the
cell? - CORRECT ANSWER The cell has a capsule.
How do basic stains work? - CORRECT 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? - CORRECT ANSWER Endospore stain
Which aspect of a staining protocol enables dye to penetrate an endospore? - CORRECT
ANSWER Heat
