Question 1

All of the following are true of acute necrotizing ulcerative gingivitis (ANUG)  except that it _______.

Accepted Answer

A)   is associated with severe pain, bleeding, pseudomembranes, and necrosis
B)   is highly contagious
C)   is due to poor oral hygiene, altered host defenses, or prior gum disease
D)   is common in AIDS patients
E)   involves Treponema vincentii, Prevotella intermedia, and FusobacteriumF) C) and D)
G) None of the above

Question 2

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) A) and E)
G) B) and D)

Question 3

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

Accepted Answer

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

Question 4

Which of the following is not true of enterotoxigenic

Accepted Answer

A)   Fluid replacement is vital to surviving an infection.
B)   It can be life-threatening in infants.
C)   It causes a high fever.
D)   It causes traveler's diarrhea.
E)   coli (ETE
C)  ?F) C) and D)
G) A) and D)

Question 5

There are vaccines for immunity to the Hepatitis B virus.

Accepted Answer

A) True 
 B)False

Question 6

E. coli O157:H7 secretes shiga exotoxin.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following is not a normal causative agent of acute diarrhea with vomiting (food poisoning) ?

Accepted Answer

A)   Clostridium perfringens
B)   Clostridium diﬃcile
C)   Bacillus cereus
D)   Staphylococcus aureusE) B) and C)
F) A) and D)

Question 8

Identiﬁcation of the causative microbe for a diarrheal infection often requires a stool culture. The best medium for this purpose is _______.

Accepted Answer

A)   a liquid medium, as the diarrhea conditions are more liquid than solid
B)   a general purpose medium that supports the growth of the diverse gut microbiota
C)   a medium containing bile as a selective agent
D)   a medium containing a broad-spectrum antibiotic as a selective agent
E)   a medium containing mammalian blood to provide extra growth factorsF) A) and D)
G) B) and C)

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) None of the above
F) B) and C)

Question 10

Which of the following statements regarding trichinosis is incorrect?

Accepted Answer

A)   Coiled larvae are encysted in skeletal muscle.
B)   The disease is associated with undercooked pork.
C)   Larvae migrate from intestines to blood and various body tissues.
D)   The disease can be transmitted by the fecal-oral route.E) B) and C)
F) C) and D)

Question 11

The most common cause of liver cancer in the United States is hepatitis ______ virus.

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) C) and D)
F) A) and B)

Question 12

Which organ of the gastrointestinal tract has a large commensal population of microorganisms?

Accepted Answer

A)   Large intestine
B)   Small intestine
C)   Pancreas
D)   Liver
E)   Salivary glandsF) All of the above
G) A) and E)

Question 13

Most antihelminthic medications act only against the pathogens, not the human host.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is not a helminth that causes intestinal symptoms accompanied by migratory symptoms?

Accepted Answer

A)   Ascaris lumbricoides
B)   Necator americanus
C)   Toxocara
D)   Trichuris trichiuraE) All of the above
F) A) and D)

Question 15

The only body ﬂuid that can transmit Hepatitis B virus is blood.

Accepted Answer

A) True 
 B)False

Question 16

As recently as the 1980s, the medical establishment believed ulcers to be caused by stress and an increase in gastric acidity. How has the current understanding of ulcer development changed patient treatment?

Accepted Answer

A)   Antibiotics are now used to treat ulcers.
B)   Different foods are now suggested for patients having ulcers.
C)   There is no treatment for ulcers, then or now.
D)   Doctors now give their patients sedatives to calm patients with ulcers.E) A) and D)
F) None of the above

Question 17

From the surface to the interior of a tooth, the tissues in order are _______.

Accepted Answer

A)   pulp, dentin, and enamel
B)   enamel, dentin, and pulp
C)   dentin, enamel, and pulp
D)   enamel, pulp, and dentin
E)   dentin, pulp, and enamelF) A) and B)
G) A) and C)

Question 18

Symptoms of cryptosporidiosis include _______.

Accepted Answer

A)   headache, sweats, vomiting, severe abdominal cramps, and diarrhea
B)   chills, fever, and sweats
C)   bloody, mucus-ﬁlled stools and fever
D)   a red skin papule that spreads to a large ulcerE) A) and D)
F) A) and C)

Question 19

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

Accepted Answer

A)   tapeworm infestation
B)   mumps
C)   hepatitis
D)   gingivitisE) A) and C)
F) B) and C)

Question 20

Giardiasis involves _______.

Accepted Answer

A)   a protozoan that does not form cysts
B)   infection of the large intestine
C)   symptoms of abdominal pain, ﬂatulence, and diarrhea
D)   vector transmission
E)   All of the choices are correct.F) B) and E)
G) C) and D)

Exam 22: Infectious Diseases Affecting the Gastrointestinal Tract

Which of the following is not true of enterotoxigenic

Correct AnswerverifiedShow Answer

Which of the following is not a normal causative agent of acute diarrhea with vomiting (food poisoning) ?

Correct AnswerverifiedShow Answer

Symptoms of cryptosporidiosis include _______.

Correct AnswerverifiedShow Answer

All of the following are true of acute necrotizing ulcerative gingivitis (ANUG) except that it _______.

Correct AnswerverifiedShow Answer

Giardiasis involves _______.

Correct AnswerverifiedShow Answer

Most antihelminthic medications act only against the pathogens, not the human host.

Correct AnswerverifiedShow Answer

Which organ of the gastrointestinal tract has a large commensal population of microorganisms?

Correct AnswerverifiedShow Answer

The most common cause of liver cancer in the United States is hepatitis ______ virus.

Correct AnswerverifiedShow Answer

There are vaccines for immunity to the Hepatitis B virus.

Correct AnswerverifiedShow Answer

The only body ﬂuid that can transmit Hepatitis B virus is blood.

Correct AnswerverifiedShow Answer

Which of the following statements regarding trichinosis is incorrect?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

As recently as the 1980s, the medical establishment believed ulcers to be caused by stress and an increase in gastric acidity. How has the current understanding of ulcer development changed patient treatment?

Correct AnswerverifiedShow Answer

Identiﬁcation of the causative microbe for a diarrheal infection often requires a stool culture. The best medium for this purpose is _______.

Correct AnswerverifiedShow Answer

E. coli O157:H7 secretes shiga exotoxin.

Correct AnswerverifiedShow Answer

From the surface to the interior of a tooth, the tissues in order are _______.

Correct AnswerverifiedShow Answer

Which of the following is not a helminth that causes intestinal symptoms accompanied by migratory symptoms?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Ascaris lumbricoides _______.

Correct AnswerverifiedShow Answer

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