WGU D311 MICROBIOLOGY STUDY FOR OA EXAM QUESTIONS AND ANSWERS | UPDATED 2026 | GRADED A

WGU D311 MICROBIOLOGY STUDY FOR OA EXAM QUESTIONS AND ANSWERS | UPDATED 2026 | GRADED A What is a characteristic of rhizospheres? - answer-The rhizosphere is where plants release organic compounds that can be metabolized by microbes into soil. Which environment would contain microbes that are psychrophilic? - answer-Glaciers What is the role of nematodes in soil? - answer-They photosynthesize and fix nitrogen. Which eukaryote is responsible for producing antibiotics to ward off bacterial competitors? - answerFungi Which symbiotic relationship is an example of mutualism? - answer-The relationship between humans and the Escherichia coli colonizing the human gut Which type of symbiotic relationship exists between the Escherichia coli (E. coli) that inhabit the human gut and the humans who utilize the vitamin K produced by E. coli? - answer-Mutualism Which description of resident microbiota is true? - answer-Resident microbiota constantly live on the human body. Which relationship is exhibited by intestinal Escherichia coli and their human host? - answer-Mutualism Which type of disease is transmitted from animals to humans? - answer-Zoonotic diseasesWhich type of disease is acquired in hospital settings? - answer-Nosocomial diseases Which portal of exit can expel the most viral particles? - answer-Respiratory Which type of disease is sickle cell anemia? - answer-Noninfectious Which type of transmission occurs when tuberculosis is spread through small particles expelled by a cough? - answer-Droplet transmission Which type of transmission occurs when pathogens are spread from mother to child during breastfeeding? - answer-Vertical direct contact transmission Which type of transmission occurs when an arthropod carries a viral pathogen inside of its body? - answer-Biological vector transmission Which type of transmission occurs through contact with a fomite? - answer-Indirect contact transmission Which infected host would be considered a passive carrier? - answer-A healthcare professional who does not wash their hands after seeing an infected patient How is Giardia lamblia, the causative agent of giardiasis, transmitted? - answer-Contaminated food or water Which organism is the definitive host of Toxoplasma gondii? - answer-Birds Which disease is transmitted by animals but not arthropods? - answer-Rabies How can adhesins be described? - answer-Adhesins found on the surface of pathogens bind to receptors of host cells.