MCB 2010C Microbiology Final Exam Latest 2024|2025
FALL-SPRING FSW GRADED A+
Which of the following is a sign of disease?
A. headache
B. dizziness
C. fever
D. nausea
E. cramps - ANSWER: C
Which of the following is a symptom of disease?
A. fever
B. swelling
C. diarrhea
D. dizziness
E. rash - ANSWER: D
What steps should a researcher take to establish a cause-and-effect relationship
between a pathogen and a lethal illness?
A. Identify the causative pathogen.
B. Obtain the pathogen from the disease outbreak patients.
C. Infect uninfected people and check for similar symptoms.
D. A, B and C
E. A and B only - ANSWER: E
Which of the following would make it not possible to satisfy all of Koch's postulates
for a particular microorganism?
A. The microorganism only infects nonhuman animals.
B. The microorganism causes serious symptoms in humans.
C. The microorganism cannot be isolated in pure culture.
D. The identity of the microorganism is in question.
E. Genes from the microorganism cannot be amplified by PCR. - ANSWER: C
You suspect that a newly discovered bacterial secretion system identified in an E. coli
strain isolated from a recent outbreak is important for secreting a particular protein
toxin that is important for virulence. How would you most directly test this
hypothesis?
A. Make a mutation in the secretion system and see if the bacterium is still virulent.
B. Make a mutation in the secretion system and see if the toxin still gets secreted.
C. Make a mutation in the toxin gene and see if the bacterium is still virulent.
D. A, B and C
E. B and C - ANSWER: B
What is a zoonosis?
A. A disease caused by normal microbiota entering a body site where they do not
normally occur.
, B. A disease acquired at a zoo.
C. A disease caused by the spread of human microbiota to animals.
D. A disease that spreads naturally from animals to humans.
E. A disease caused by changes in the balance between animal and human
microbiomes. - ANSWER: D
What is one reason that does not explain why animal reservoirs contribute to human
diseases more than human reservoirs?
A. Many humans eat animals.
B. Animal behaviors are more difficult to control than human behaviors.
C. Animal reservoirs are more difficult to eradicate than human reservoirs.
D. Animal immune systems are more evolved to prevent cross species transmission
than human immune systems.
E. There are a far greater number of animals on the planet than humans. - ANSWER:
D
Which of the following is TRUE of a disease carrier?
A. Carriers never develop the disease.
B. Most carriers have a weakened immune system.
C. Some carriers never become sick.
D. Carriers are never infectious for more than a few days. - ANSWER: C
Cold and influenza viruses typically enter the body through which route?
A. Eyes
B. Mouth
C. Nose
D. Parenteral route - ANSWER: A
Why is the tube emptying the bladder (the urethra) more likely to be a portal of exit
than a portal of entry?
A. Urine is sterile when it leaves the body.
B. Urine mechanically flushes invading microbes out of the body.
C. Urine is acidic and doesn't allow microorganisms to enter.
D. Urine is basic and doesn't allow microorganisms to enter.
E. Urine has few nutrients and doesn't allow microorganisms to grow. - ANSWER: B
Which of the following reasons does not contribute to elevated prevalence of
infectious disease in third-world countries?
A. The water is more contaminated
B. Greater prevalence of pathogenic microbes
C. Poor sanitation
D. Microbes are more pathogenic
E. Less education about pathogen transmission - ANSWER: D
Which of the following is not an example of innate immunity?
A. Lysozyme in tears.
B. Antibodies.
FALL-SPRING FSW GRADED A+
Which of the following is a sign of disease?
A. headache
B. dizziness
C. fever
D. nausea
E. cramps - ANSWER: C
Which of the following is a symptom of disease?
A. fever
B. swelling
C. diarrhea
D. dizziness
E. rash - ANSWER: D
What steps should a researcher take to establish a cause-and-effect relationship
between a pathogen and a lethal illness?
A. Identify the causative pathogen.
B. Obtain the pathogen from the disease outbreak patients.
C. Infect uninfected people and check for similar symptoms.
D. A, B and C
E. A and B only - ANSWER: E
Which of the following would make it not possible to satisfy all of Koch's postulates
for a particular microorganism?
A. The microorganism only infects nonhuman animals.
B. The microorganism causes serious symptoms in humans.
C. The microorganism cannot be isolated in pure culture.
D. The identity of the microorganism is in question.
E. Genes from the microorganism cannot be amplified by PCR. - ANSWER: C
You suspect that a newly discovered bacterial secretion system identified in an E. coli
strain isolated from a recent outbreak is important for secreting a particular protein
toxin that is important for virulence. How would you most directly test this
hypothesis?
A. Make a mutation in the secretion system and see if the bacterium is still virulent.
B. Make a mutation in the secretion system and see if the toxin still gets secreted.
C. Make a mutation in the toxin gene and see if the bacterium is still virulent.
D. A, B and C
E. B and C - ANSWER: B
What is a zoonosis?
A. A disease caused by normal microbiota entering a body site where they do not
normally occur.
, B. A disease acquired at a zoo.
C. A disease caused by the spread of human microbiota to animals.
D. A disease that spreads naturally from animals to humans.
E. A disease caused by changes in the balance between animal and human
microbiomes. - ANSWER: D
What is one reason that does not explain why animal reservoirs contribute to human
diseases more than human reservoirs?
A. Many humans eat animals.
B. Animal behaviors are more difficult to control than human behaviors.
C. Animal reservoirs are more difficult to eradicate than human reservoirs.
D. Animal immune systems are more evolved to prevent cross species transmission
than human immune systems.
E. There are a far greater number of animals on the planet than humans. - ANSWER:
D
Which of the following is TRUE of a disease carrier?
A. Carriers never develop the disease.
B. Most carriers have a weakened immune system.
C. Some carriers never become sick.
D. Carriers are never infectious for more than a few days. - ANSWER: C
Cold and influenza viruses typically enter the body through which route?
A. Eyes
B. Mouth
C. Nose
D. Parenteral route - ANSWER: A
Why is the tube emptying the bladder (the urethra) more likely to be a portal of exit
than a portal of entry?
A. Urine is sterile when it leaves the body.
B. Urine mechanically flushes invading microbes out of the body.
C. Urine is acidic and doesn't allow microorganisms to enter.
D. Urine is basic and doesn't allow microorganisms to enter.
E. Urine has few nutrients and doesn't allow microorganisms to grow. - ANSWER: B
Which of the following reasons does not contribute to elevated prevalence of
infectious disease in third-world countries?
A. The water is more contaminated
B. Greater prevalence of pathogenic microbes
C. Poor sanitation
D. Microbes are more pathogenic
E. Less education about pathogen transmission - ANSWER: D
Which of the following is not an example of innate immunity?
A. Lysozyme in tears.
B. Antibodies.
