Question 1

Which of the following symptoms of trichinosis is most indicative of this disease?

Accepted Answer

A)   Puffiness around the eyes
B)   Shortness of breath
C)   Abdominal pain
D)   EosinophiliaE) All of the above
F) B) and C)

Question 2

Cells of the immune system are not found in which of the following tissues in the gastrointestinal tract?

Accepted Answer

A)   Tonsils and adenoids
B)   Appendix
C)   Peyer's patches
D)   Tooth enamelE) None of the above
F) All of the above

Question 3

Orchitis and epididymitis are seen in young,adult males as a complication of ______.

Accepted Answer

A)   hepatitis
B)   tapeworm infestation
C)   mumps
D)   gingivitisE) All of the above
F) A) and C)

Question 4

Which of the following statements concerning archaea in the microbiome is correct?

Accepted Answer

A)   Archaea evolved under extreme conditions and are not commensal with humans.
B)   The human body is a hostile environment for archaea.
C)   Methanogens are associated with anaerobic regions of the gut and the gingival pockets.
D)   Archaeal infections are treated with translation inhibitors, as their ribosomes are the same as bacterial ribosomes.E) B) and C)
F) C) and D)

Question 5

All of the following diseases can be transmitted by drinking contaminated water except ______.

Accepted Answer

A)   trichinosis
B)   campylobacter
C)   cyclosporiasis
D)   giardiasis
E)   cryptosporidiosisF) C) and E)
G) A) and D)

Question 6

Hepatitis B virus

Accepted Answer

A)   is principally transmitted by blood.
B)   transmission risks include shared needles, anal intercourse, and heterosexual intercourse.
C)   is transmitted to newborns from chronic carrier mothers.
D)   has many chronic carriers.
E)   All of the choices are correct.F) A) and B)
G) All of the above

Question 7

The transmission cycle of Fasciola hepatica differs from the cycles of Opisthorchis sinensis and Clonorchis sinensis in that

Accepted Answer

A)   freshwater snails release cercariae.
B)   eggs are released from an infected human via the urine.
C)   encystment occurs on a freshwater plant.
D)   helminth development occurs in the liver.E) A) and B)
F) A) and C)

Question 8

Ascaris lumbricoides

Accepted Answer

A)   is an intestinal roundworm.
B)   spreads to humans by ingestion of Ascaris eggs in food.
C)   larvae penetrate into lymphatics and capillaries around intestines.
D)   larvae migrate to the pharynx, get swallowed, and return to intestines to mature.
E)   All of the choices are correct.F) All of the above
G) D) and E)

Question 9

Which of the following hepatitis viruses is mismatched with its description?

Accepted Answer

A)   Hepatitis A virus - nonenveloped, single-stranded RNA enterovirus
B)   Hepatitis B virus - enveloped DNA virus
C)   Hepatitis C virus - RNA virus
D)   Hepatitis D virus - defective RNA virus that coinfects with hepatitis A virusE) A) and B)
F) None of the above

Question 10

Pathogenicity islands are

Accepted Answer

A)   gene clusters that confer the ability to become pathogenic.
B)   closely related groups of pathogenic enteric organisms.
C)   enzymes like proteases and hemolysins that promote pathogenesis.
D)   a lymphoid tissue present in the small intestine.E) A) and B)
F) B) and D)

Question 11

Despite acidic conditions,some microorganisms have been found residing within the human stomach.

Accepted Answer

A) True 
 B)False

Question 12

Cholera symptoms are

Accepted Answer

A)   copious watery diarrhea.
B)   loss of blood volume.
C)   acidosis, sunken eyes, and thirst.
D)   hypotension, tachycardia, and shock.
E)   All of the choices are correct.F) D) and E)
G) C) and D)

Question 13

Enterotoxin production is a characteristic of ______.

Accepted Answer

A)   Clostridium perfringens
B)   Clostridium difficile
C)   Clostridium tetani
D)   Clostridium botulinumE) All of the above
F) A) and D)

Question 14

In the absence of dietary carbohydrates,bacteria do not cause tooth decay.

Accepted Answer

A) True 
 B)False

Question 15

Because of the complexity of the Schistosoma life cycle,there are several parts of the cycle that could be disrupted to halt the spread of the disease.Which of the following proposals is not likely to succeed in decreasing the prevalence of schistosomiasis?

Accepted Answer

A)   Apply chemical molluscicides (chemicals targeted to molluscs like snails)  to bodies of fresh water.
B)   Monitor water bodies to detect the presence of infectious miracidia and enforce no bathing rules when they are present.
C)   Identify a surface protein on Schistosoma miracidia that the immune system can recognize and create a vaccine using that antigen.
D)   Install sanitary sewage treatment facilities to prevent the dispersal of eggs present in urine and feces.E) A) and B)
F) All of the above

Question 16

Hepatitis B infection

Accepted Answer

A)   has an incubation of 2 to 3 weeks.
B)   increases risk for hepatocellular cancer.
C)   can be transmitted by the fecal-oral route.
D)   is responsible for most cases of post-transfusion hepatitis.E) C) and D)
F) A) and B)

Question 17

Which of the following pathogens has an infectious dose so low that a single infectious particle (cell,cyst,endospore,virus) can cause disease?

Accepted Answer

A)   Clostridium difficile
B)   Hepatitis A virus
C)   Shigella
D)   Giardia
E)   NorovirusF) A) and C)
G) C) and D)

Question 18

Gingivitis

Accepted Answer

A)   involves the formation of calculus and plaque.
B)   is primarily caused by normal anaerobic biota.
C)   involves a crevice in the gum along the tooth.
D)   may involve archaeal species.
E)   All of the choices are correct.F) C) and D)
G) A) and C)

Question 19

Which of the following fluids within the gastrointestinal tract is correctly paired with its antimicrobial effect?

Accepted Answer

A)   Stomach fluid; high pH
B)   Bile; lactoferrin
C)   Pancreatic fluid; IgE
D)   Saliva; lysozymeE) None of the above
F) A) and B)

Question 20

Enterobius vermicularis is

Accepted Answer

A)   a whipworm.
B)   common only to the tropics and subtropics.
C)   an intestinal helminth that easily contaminates fingers and fomites.
D)   often fatal in heavy infestations.
E)   All of the choices are correct.F) B) and C)
G) None of the above

Exam 22: Infectious Diseases Affecting the Gastrointestinal Tract

Which of the following hepatitis viruses is mismatched with its description?

Correct AnswerverifiedShow Answer

Ascaris lumbricoides

Correct AnswerverifiedShow Answer

The transmission cycle of Fasciola hepatica differs from the cycles of Opisthorchis sinensis and Clonorchis sinensis in that

Correct AnswerverifiedShow Answer

Because of the complexity of the Schistosoma life cycle,there are several parts of the cycle that could be disrupted to halt the spread of the disease.Which of the following proposals is not likely to succeed in decreasing the prevalence of schistosomiasis?

Correct AnswerverifiedShow Answer

Despite acidic conditions,some microorganisms have been found residing within the human stomach.

Correct AnswerverifiedShow Answer

Which of the following pathogens has an infectious dose so low that a single infectious particle (cell,cyst,endospore,virus) can cause disease?

Correct AnswerverifiedShow Answer

Cells of the immune system are not found in which of the following tissues in the gastrointestinal tract?

Correct AnswerverifiedShow Answer

Pathogenicity islands are

Correct AnswerverifiedShow Answer

In the absence of dietary carbohydrates,bacteria do not cause tooth decay.

Correct AnswerverifiedShow Answer

Enterobius vermicularis is

Correct AnswerverifiedShow Answer

All of the following diseases can be transmitted by drinking contaminated water except ______.

Correct AnswerverifiedShow Answer

Hepatitis B infection

Correct AnswerverifiedShow Answer

Which of the following statements concerning archaea in the microbiome is correct?

Correct AnswerverifiedShow Answer

Which of the following symptoms of trichinosis is most indicative of this disease?

Correct AnswerverifiedShow Answer

Orchitis and epididymitis are seen in young,adult males as a complication of ______.

Correct AnswerverifiedShow Answer

Cholera symptoms are

Correct AnswerverifiedShow Answer

Enterotoxin production is a characteristic of ______.

Correct AnswerverifiedShow Answer

Gingivitis

Correct AnswerverifiedShow Answer

Which of the following fluids within the gastrointestinal tract is correctly paired with its antimicrobial effect?

Correct AnswerverifiedShow Answer

Hepatitis B virus

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified