D311 MICROBIOLOGY WGU OA COMPLETE
EXAMINATION TEST QUESTIONS WITH
VERIFIED SOLUTIONS
●● 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: differential staining technique used to distinguish between acid-
fast and non-acid-fast bacteria based on the presence of mycolic acid in
their cell walls. The high lipid content of acid-fast organisms, like
,Mycobacterium, requires special stains, such as Carbolfuchsin, to
penetrate their waxy cell walls
●● 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 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?
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
EXAMINATION TEST QUESTIONS WITH
VERIFIED SOLUTIONS
●● 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: differential staining technique used to distinguish between acid-
fast and non-acid-fast bacteria based on the presence of mycolic acid in
their cell walls. The high lipid content of acid-fast organisms, like
,Mycobacterium, requires special stains, such as Carbolfuchsin, to
penetrate their waxy cell walls
●● 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 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?
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
