WGU D311 Microbiology OA Microbiology WGU OA BEST REVIEW 2025

D311: Microbiology WGU OA BEST
REVIEW 2025

What is the significance of microorganisms containing a thick coat of peptldogiywn within the cell wall? -
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Microorganisms containing a thick coat of peptidoglycan within the cell wall are typically classified as gram-
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positive bacteria. b




Why are viruses considered aceilular? - They cannot reproduce without a host.
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What is the defining characteristic of eukaryotes? - They have a nucleus.
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Which microorganism can cause vaginal yeast Infections and oral thrush? - Fungi
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Why can It be difficult to determine the etiologic agent of a disease? - Some signs and symptoms can be
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caused by many different etiologic agents.
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What kind of staining technique Is the acid-fast stain? -
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A doctor prescribed antibiotics for a patient complaining of runny nose. fever. and aches and pains. Which
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type of infection did the doctor suspect? - The doctor likely suspected a viral infection because antibiotics
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are not effective against viral infections.
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A healthcare professional is treating a patient who developed a yeast infection after taking antibiotics.
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What type of medication should be prescribed to this patient? - Antifungals
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Which structure promotes motility in Proteus. Shigelia. and Salmonella species. all of which can cause
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serious disease in humans? - Presence of flagella
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Which bacterial virulence factor allows a strain to resist phagocytosis, increasing the organism's virulence? -
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Capsule production
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, Why is treating Haemophilus influenzae difficult? - The capsule is antiphagocytic.
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How do pili aid pathogens in causing disease? - They cause pathogens to adhere to host cells.
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Which virulence factor allows pathogens to penetrate the dermis and invade the body? - Bacterial enzymes
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A bacterium from a deep-sea hydrothermal vent has been cultured. Which staining technique should be
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used to begin the process of species identification? - Gram staining
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What does the presence of a clear area around a cell stained with India ink indicate about the cell? - The cell
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has a capsule.
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How do basic stains work? - The positively charged stain is attracted to the negatively charged portion of the
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cell.
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Which staining technique is used to distinguish bacteria based on their ability to produce structures that can
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survive extreme heat stress? - Endospore stain
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Which aspect of a staining protocol enables dye to penetrate an endospore? - Heat
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Why are the relationships between pathogenic microbes and their hosts considered parasitic? - The
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microbe benefits from the interaction while the host is harmed.
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Which characteristic of dracunculiasis has been pivotal to the success of its eradication campaign? -
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Dracunculiasis has no animal reservoir.
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Which type of organism would be most likely to grow on food stored in a refrigerator or freezer? - A
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psychrophile would be most likely to grow on food stored in a refrigerator or freezer as these
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microorganisms thrive in cold temperatures.
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