BI234 MICROBIOLOGY FINAL ACTUAL EXAM QUESTIONS
AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
LATEST UPDATE 2024/2025
What is the difference between commensalism and parasitism?
Commensalism is when one organism is benefited and the other is not affected at all.
Parasitism is when one organism is benefited at the expense of the other.
Give an example of how a patient might catch botulism?
Ingest food that was not properly canned.
Give an example of how a patient might catch tetanus?
deep puncture wound.
Why would hyperbaric therapy be effective for botulim and tetanus infections?
Because they are both obligate anaerobes and oxygen would kill them.
What type of bacteria generally create toxemia after antibiotic therapy? Why?
Gram negative bacteria because when they die they would release their endotoxin.
What is the difference between ID50 and LD50?
ID50 - infectious dose for 50% of the test population.
LD50 - lethal dose for 50% of the test population.
, What are nosocomial infections?
Hospital acquired infections
What are the most common nosocomial infections today?
Pneumonia - dry ventilator air, (CRE) K. pneumoniae
GI - C. diff, norovirus, Carbapenem-resistant Enterobacteriaceae (E. coli)
UTI - catheters, K. pneumoniae
Bloodstream infections - septicemia K. pneumoniae
Surgical site infections
Other
Why do epidemiologists want to know the ID50 and LD50?
So they know how scary it is...
A child at daycare has a runny nose. You ask him if he feels sick and he says "a little". This would be
consistent with what part of the illness symptoms chart (what part of the curve)?
prodromal period (mild signs or symptoms)
Why is skin such a good barrier to microbial infections? 3 reasons why...
-natural shedding of surface cells
-salt inhibits microbes
-lysozyme hydrolyzes peptidoglycan
-fatty acids inhibit some pathogens
Rashes are so wonderful to classify - what are the key word associated with rashes and what do they
mean?
AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
LATEST UPDATE 2024/2025
What is the difference between commensalism and parasitism?
Commensalism is when one organism is benefited and the other is not affected at all.
Parasitism is when one organism is benefited at the expense of the other.
Give an example of how a patient might catch botulism?
Ingest food that was not properly canned.
Give an example of how a patient might catch tetanus?
deep puncture wound.
Why would hyperbaric therapy be effective for botulim and tetanus infections?
Because they are both obligate anaerobes and oxygen would kill them.
What type of bacteria generally create toxemia after antibiotic therapy? Why?
Gram negative bacteria because when they die they would release their endotoxin.
What is the difference between ID50 and LD50?
ID50 - infectious dose for 50% of the test population.
LD50 - lethal dose for 50% of the test population.
, What are nosocomial infections?
Hospital acquired infections
What are the most common nosocomial infections today?
Pneumonia - dry ventilator air, (CRE) K. pneumoniae
GI - C. diff, norovirus, Carbapenem-resistant Enterobacteriaceae (E. coli)
UTI - catheters, K. pneumoniae
Bloodstream infections - septicemia K. pneumoniae
Surgical site infections
Other
Why do epidemiologists want to know the ID50 and LD50?
So they know how scary it is...
A child at daycare has a runny nose. You ask him if he feels sick and he says "a little". This would be
consistent with what part of the illness symptoms chart (what part of the curve)?
prodromal period (mild signs or symptoms)
Why is skin such a good barrier to microbial infections? 3 reasons why...
-natural shedding of surface cells
-salt inhibits microbes
-lysozyme hydrolyzes peptidoglycan
-fatty acids inhibit some pathogens
Rashes are so wonderful to classify - what are the key word associated with rashes and what do they
mean?
