MCB 100 EXAM 3 ICLICKERS QUESTIONS
Which of the following is a sign of disease?
A.headache
B. dizziness
C. fever
D.nausea
E. cramps - Answers -C
Which of the following is a symptom of disease?
A.fever
B.swelling
C. diarrhea
D.dizziness
E. rash - Answers -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 - Answers -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 - Answers -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 - Answers -B
Why is the tube emptying the bladder (called the urethra) more likely to be a portal of
exit than a portal of entry?
A. Urine is sterile when it leave 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 microorganism to enter
E. Urine has few nutrients and doesn't allow microorganisms to grow - Answers -B
What is one reason that does not explain why animal reservoirs contribute to human
diseases more than human reservoirs do?
A. Animal reservoirs are more difficult to eradicate than human reservoirs
B. Animal behaviors are more difficult to control than human behaviors.
C. Animal immune systems are more evolved to prevent cross species transmission
than human immune systems
D. Many humans eat animals
E. There are a far greater number of animals on the planet than humans. - Answers -C
What is a zoonosis?
A. A disease caused by normal microbiota entering a body site where they do not
normally occur
B. A disease that spreads naturally between animals and humans
C. A disease caused by the spread of human microbiota to animals
D. A disease caused by changes in the balance between animal and human
microbiomes
E. A disease acquired at a zoo - Answers -B
Cold and influenza viruses typically enter the body through which routes?
A. Eyes
B. Nose
C. Parenteral routes
D. Mouth
E. Fecal - Answers -A,B,D
Which of the following is TRUE of a disease carrier?
A. Carriers are never infectious for more than a few days
B. Carriers only transmit disease through direct contact
C. Carriers never develop the disease
D. Some carriers never become sick
E. Most carriers have a weakened immune system - Answers -D
Which of the following is NOT a way that normal microbiota help protect the body from
pathogens?
A. All of the other choices are correct statements
B. They keep the immune system stimulates and ready
C. They consume available nutrients
D. They prevent pathogens from attaching
E. They can alter the pH of their environment
F. They can attack and kill pathogenic microbes - Answers -A
The role of goblet cells in the mucosal layer of the intestine is to
Which of the following is a sign of disease?
A.headache
B. dizziness
C. fever
D.nausea
E. cramps - Answers -C
Which of the following is a symptom of disease?
A.fever
B.swelling
C. diarrhea
D.dizziness
E. rash - Answers -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 - Answers -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 - Answers -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 - Answers -B
Why is the tube emptying the bladder (called the urethra) more likely to be a portal of
exit than a portal of entry?
A. Urine is sterile when it leave 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 microorganism to enter
E. Urine has few nutrients and doesn't allow microorganisms to grow - Answers -B
What is one reason that does not explain why animal reservoirs contribute to human
diseases more than human reservoirs do?
A. Animal reservoirs are more difficult to eradicate than human reservoirs
B. Animal behaviors are more difficult to control than human behaviors.
C. Animal immune systems are more evolved to prevent cross species transmission
than human immune systems
D. Many humans eat animals
E. There are a far greater number of animals on the planet than humans. - Answers -C
What is a zoonosis?
A. A disease caused by normal microbiota entering a body site where they do not
normally occur
B. A disease that spreads naturally between animals and humans
C. A disease caused by the spread of human microbiota to animals
D. A disease caused by changes in the balance between animal and human
microbiomes
E. A disease acquired at a zoo - Answers -B
Cold and influenza viruses typically enter the body through which routes?
A. Eyes
B. Nose
C. Parenteral routes
D. Mouth
E. Fecal - Answers -A,B,D
Which of the following is TRUE of a disease carrier?
A. Carriers are never infectious for more than a few days
B. Carriers only transmit disease through direct contact
C. Carriers never develop the disease
D. Some carriers never become sick
E. Most carriers have a weakened immune system - Answers -D
Which of the following is NOT a way that normal microbiota help protect the body from
pathogens?
A. All of the other choices are correct statements
B. They keep the immune system stimulates and ready
C. They consume available nutrients
D. They prevent pathogens from attaching
E. They can alter the pH of their environment
F. They can attack and kill pathogenic microbes - Answers -A
The role of goblet cells in the mucosal layer of the intestine is to
