WGU D311 Microbiology Questions and
Answers | Complete Study Guide with
Rationales | Grade A+
• 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? -✓✓
• 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 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? -✓✓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.
• How do basic stains work? -✓✓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? -✓✓Endospore stain
• Which aspect of a staining protocol enables dye to penetrate an endospore? -
✓✓Heat
Answers | Complete Study Guide with
Rationales | Grade A+
• 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? -✓✓
• 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 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? -✓✓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.
• How do basic stains work? -✓✓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? -✓✓Endospore stain
• Which aspect of a staining protocol enables dye to penetrate an endospore? -
✓✓Heat
