WGU D311 MICROBIOLOGY COMPREHENSIVE EXAM
QUESTIONS AND ANSWERS MARKED A+
✔✔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
✔✔Why are the relationships between pathogenic microbes and their hosts considered
parasitic? - ✔✔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? - ✔✔Dracunculiasis has no animal reservoir.
✔✔Which type of organism would be most likely to grow on food stored in a refrigerator
or freezer? - ✔✔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? - ✔✔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
✔✔Why is the production of lactic acid by the resident microbe Lactobacillus Important
to human health? - ✔✔Lactic acid is important to human health because it inhibits the
growth of pathogenic yeasts.
✔✔Which type of infections are prevented by proper sterilization of hospital equipment
and healthcare worker handwashing? - ✔✔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? - ✔✔Vector
transmission is described in this scenario.
, ✔✔Which is a description of vehicle transmission? - ✔✔A person drinks untreated water
on vacation and later has diarrhea and nausea is a description of vehicle transmission.
✔✔Which organism type contains species that perform adhesion through the unique
use of its flagella to move out fluid from under a large adhesive disc, resulting in lower
pressure to adhere to the intestinal lining? - ✔✔Protozoa
✔✔A patient presents to the emergency department with high fever. difficulty breathing.
vomiting, coughing up blood. and severe chest pain when inhaling. Which pathogen
would the provider suspect? - ✔✔Bacillus anthracis
✔✔Which activity of the complement system would be useful against an infection
caused by a gram-negative bacterium? - ✔✔Membrane attack complex
✔✔Which body system is protected by the ciliary escalator? - ✔✔Respiratory
✔✔What is the role of global public health organizations in eradication of diseases, like
polio? - ✔✔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? -
✔✔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? -
✔✔These individuals all consumed contaminated food from a common manufacturing
source.
✔✔Which action is an innate physical defense? - ✔✔Mucous secretions trapping and
removing microbes from the respiratory tract.
✔✔Which vaccine type would be effective against an organism that can produce a
capsule? - ✔✔Conjugate
✔✔Vhich protocol for microbial growth control leaves the least number of living cells? -
✔✔Sterilization
✔✔Which type of microbial control is necessary for surgical equipment? -
✔✔Sterilization
QUESTIONS AND ANSWERS MARKED A+
✔✔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
✔✔Why are the relationships between pathogenic microbes and their hosts considered
parasitic? - ✔✔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? - ✔✔Dracunculiasis has no animal reservoir.
✔✔Which type of organism would be most likely to grow on food stored in a refrigerator
or freezer? - ✔✔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? - ✔✔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
✔✔Why is the production of lactic acid by the resident microbe Lactobacillus Important
to human health? - ✔✔Lactic acid is important to human health because it inhibits the
growth of pathogenic yeasts.
✔✔Which type of infections are prevented by proper sterilization of hospital equipment
and healthcare worker handwashing? - ✔✔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? - ✔✔Vector
transmission is described in this scenario.
, ✔✔Which is a description of vehicle transmission? - ✔✔A person drinks untreated water
on vacation and later has diarrhea and nausea is a description of vehicle transmission.
✔✔Which organism type contains species that perform adhesion through the unique
use of its flagella to move out fluid from under a large adhesive disc, resulting in lower
pressure to adhere to the intestinal lining? - ✔✔Protozoa
✔✔A patient presents to the emergency department with high fever. difficulty breathing.
vomiting, coughing up blood. and severe chest pain when inhaling. Which pathogen
would the provider suspect? - ✔✔Bacillus anthracis
✔✔Which activity of the complement system would be useful against an infection
caused by a gram-negative bacterium? - ✔✔Membrane attack complex
✔✔Which body system is protected by the ciliary escalator? - ✔✔Respiratory
✔✔What is the role of global public health organizations in eradication of diseases, like
polio? - ✔✔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? -
✔✔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? -
✔✔These individuals all consumed contaminated food from a common manufacturing
source.
✔✔Which action is an innate physical defense? - ✔✔Mucous secretions trapping and
removing microbes from the respiratory tract.
✔✔Which vaccine type would be effective against an organism that can produce a
capsule? - ✔✔Conjugate
✔✔Vhich protocol for microbial growth control leaves the least number of living cells? -
✔✔Sterilization
✔✔Which type of microbial control is necessary for surgical equipment? -
✔✔Sterilization
