WGU D311 OA Final Exam | D311 Microbiology Objective Assessment Final Exam Complete Questions and Correct Answers (Verified) | Graded A+| Newest 2026/2027 l Brand New Version!!

WGU D311 OA Final Exam | D311 Microbiology Objective Assessment Final Exam Complete Questions and Correct Answers (Verified) | Graded A+| Newest 2026/2027 l Brand New Version!!What is the significance of microorganisms containing a thick coat of peptldogiywn within the cell wall? - ANSWER=Microorganisms containing a thick coat of peptidoglycan within the cell wall are typically classified as gram-positive bacteria. 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= 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 viral infection because antibiotics are not effective against viral infections. 2 | P a g e 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 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 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 3 | P a g e 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 Which aspect of a staining protocol enables dye to penetrate an endospore? - ANSWER=Heat Why are the relationships between pathogenic microbes and their hosts considered parasitic? - ANSWER=The microbe benefits from the interaction while the host is harmed. Which characteristic of dracunculiasis has been pivotal to the success of its eradication campaign? - ANSWER=Dracunculiasis has no animal reservoir. Which type of organism would be most likely to grow on food stored in a refrigerator or freezer? - ANSWER=A psychrophile would be most likely to grow on food stored in a refrigerator or freezer as these microorganisms thrive in cold temperatures. Staphylococcus epidermldls is a member of the human resident microbiota and considered part of the human innate immune system. S. epldermidis uses our dead skin cells as a source of nutrients. What type of relationship between S. epidermidis and humans is described above? - ANSWER=The type of relationship between Staphylococcus epidermidis and humans described above is "Commensalism," where one organism (S. epidermidis) benefits (uses dead skin cells) without harming the other organism (humans). Commensalism 4 | P a g e Why is the production of lactic acid by the resident microbe Lactobacillus Important to human health? - ANSWER=Lactic acid is important to human health because it inhibits the growth of pathogenic yeasts. 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 Which type of infections are prevented by proper sterilization of hospital equipment and healthcare worker handwashing? - ANSWER=Nosocomial infections are prevented by proper sterilization of hospital equipment and healthcare worker handwashing. A patient Is determined to have contracted Lyme disease after being bit by an infected tick. What type of transmission is described in this scenario? - ANSWER=Vector transmission is described in this scenario. 5 | P a g e Which is a description of vehicle transmission? - ANSWER=A person drinks untreated water on vacation and later has diarrhea and nausea is a description of vehicle transmission. Which body system is protected by the ciliary escalator? - ANSWER=Respiratory What is the role of global public health organizations in eradication of diseases, like polio? - ANSWER=Organize vaccination campaigns and programs Malaria cases are routinely found in certain areas of the world but are not seen In other areas. How would malaria be described in those areas where it is found? - ANSWER=Endemic A hospital notices an increase in patients being admitted with gastrointestinal symptoms and dehydration over a two-week period. An epidemiological analysis reveals that the cause is the same pathogen, but that none of the hospitalized individuals were ever in the same location at the same time. What is an explanation for this analysis? - ANSWER=These individuals all consumed contaminated food from a common manufacturing source. Which action is an innate physical defense? - ANSWER=Mucous secretions trapping and removing microbes from the respiratory tract.