Nester's Microbiology: A Human Perspective

Denise Anderson, Sarah Salm, Deborah Allen

Chapter 24

Digestive System Infections - all with Video Answers

Educators

Chapter Questions

Problem 1

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.

Christian Daniele

Christian Daniele

Numerade Educator

Problem 2

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.

Joanna Quigley

Numerade Educator

Problem 3

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.

Joanna Quigley

Numerade Educator

Problem 4

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.

Joanna Quigley

Numerade Educator

Problem 5

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.

Joanna Quigley

Numerade Educator

Problem 6

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.

Joanna Quigley

Numerade Educator

Problem 7

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.

Joanna Quigley

Numerade Educator

Problem 8

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) $\mathrm{HCV}$ 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.

Noah Boudrie

Numerade Educator

Problem 9

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 cirthosis.

Joanna Quigley

Numerade Educator

Problem 10

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.

Joanna Quigley

Numerade Educator