question
Which of the following about intestinal bacteria is false?
a) They produce vitamins.
b) They can produce carcinogens.
c) They are mostly aerobes.
d) They produce gas from indigestible substances in foods.
e) They include potential pathogens.
a) They produce vitamins.
b) They can produce carcinogens.
c) They are mostly aerobes.
d) They produce gas from indigestible substances in foods.
e) They include potential pathogens.
answer
c) They are mostly aerobes.
question
All of the following attributes of Streptococcus mutans are important in tooth decay except
a) it produces endotoxin, which triggers an inflammatory response.
b) it can grow at pH below 5.
c) it produces lactic acid.
d) it synthesizes glucan.
e) it stores fermentable polysaccharide.
a) it produces endotoxin, which triggers an inflammatory response.
b) it can grow at pH below 5.
c) it produces lactic acid.
d) it synthesizes glucan.
e) it stores fermentable polysaccharide.
answer
a) it produces endotoxin, which triggers an inflammatory response.
question
Helicobacter pylori has all of the following characteristics except
a) it is a helical bacterium with sheathed flagella.
b) it has not been cultivated in vitro.
c) it produces a powerful urease.
d) it causes long-term infections, lasting for years.
e) it can cause stomach ulcers.
a) it is a helical bacterium with sheathed flagella.
b) it has not been cultivated in vitro.
c) it produces a powerful urease.
d) it causes long-term infections, lasting for years.
e) it can cause stomach ulcers.
answer
b) it has not been cultivated in vitro.
question
Vibrio cholerae pathogenesis involves all of the following except
a) attachment to the small intestinal epithelium.
b) production of cholera toxin.
c) lysogenic conversion.
d) acid resistance.
e) watery diarrhea.
a) attachment to the small intestinal epithelium.
b) production of cholera toxin.
c) lysogenic conversion.
d) acid resistance.
e) watery diarrhea.
answer
d) acid resistance.
question
Which of the following statements concerning Salmonella enterica serotype Typhi is false?
a) It is commonly acquired from domestic animals.
b) It can colonize the gallbladder for years.
c) It is highly resistant to killing by bile.
d) It can destroy Peyer's patches.
e) It causes typhoid fever.
a) It is commonly acquired from domestic animals.
b) It can colonize the gallbladder for years.
c) It is highly resistant to killing by bile.
d) It can destroy Peyer's patches.
e) It causes typhoid fever.
answer
a) It is commonly acquired from domestic animals.
question
Which statement about rotaviral gastroenteritis is false?
a) A vaccine is available to prevent the disease.
b) On a worldwide basis, most of the deaths are due to dehydration.
c) Most cases of the disease occur in infants and children.
d) The causative agent infects mainly the stomach.
e) The disease is transmitted by the fecal-oral route.
a) A vaccine is available to prevent the disease.
b) On a worldwide basis, most of the deaths are due to dehydration.
c) Most cases of the disease occur in infants and children.
d) The causative agent infects mainly the stomach.
e) The disease is transmitted by the fecal-oral route.
answer
d) The causative agent infects mainly the stomach.
question
Which of the following statements about noroviruses is false?
a) They are the most common cause of viral gastroenteritis in the United States.
b) They have a low infectious dose.
c) They generally cause vomiting lasting 1 to 2 weeks.
d) Immunity does not last long.
e) They are a category B bioterrorism agent.
a) They are the most common cause of viral gastroenteritis in the United States.
b) They have a low infectious dose.
c) They generally cause vomiting lasting 1 to 2 weeks.
d) Immunity does not last long.
e) They are a category B bioterrorism agent.
answer
c) They generally cause vomiting lasting 1 to 2 weeks.
question
Which of the following statements about hepatitis is false?
a) Both RNA and DNA viruses can cause hepatitis.
b) Some kinds of hepatitis can be prevented by vaccines.
c) HCV infections are often associated with injected-drug abuse.
d) Lifelong carriers of hepatitis A are common.
e) Hepatitis A spreads by the fecal-oral route.
a) Both RNA and DNA viruses can cause hepatitis.
b) Some kinds of hepatitis can be prevented by vaccines.
c) HCV infections are often associated with injected-drug abuse.
d) Lifelong carriers of hepatitis A are common.
e) Hepatitis A spreads by the fecal-oral route.
answer
d) Lifelong carriers of hepatitis A are common.
question
Which of the following statements about hepatitis B virus is false?
a) Replication involves reverse transcriptase.
b) Infected persons may have large numbers of non-infectious viral particles circulating in their bloodstream.
c) In the United States, infection rates have been steadily increasing over the last few years.
d) Asymptomatic infections can last for years.
e) Infection can result in cirrhosis.
a) Replication involves reverse transcriptase.
b) Infected persons may have large numbers of non-infectious viral particles circulating in their bloodstream.
c) In the United States, infection rates have been steadily increasing over the last few years.
d) Asymptomatic infections can last for years.
e) Infection can result in cirrhosis.
answer
c) In the United States, infection rates have been steadily increasing over the last few years.
question
Choose the most accurate statement about cryptosporidiosis.
a) Waterborne transmission is unlikely.
b) The host range of the causative agent is narrow.
c) It is prevented by chlorination of drinking water.
d) Person-to-person spread does not occur.
e) The life cycle of the causative agent occurs within small intestinal epithelial cells.
a) Waterborne transmission is unlikely.
b) The host range of the causative agent is narrow.
c) It is prevented by chlorination of drinking water.
d) Person-to-person spread does not occur.
e) The life cycle of the causative agent occurs within small intestinal epithelial cells.
answer
e) The life cycle of the causative agent occurs within small intestinal epithelial cells.
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