Question 1

All of the following are gram-negative rods that cause gastroenteritis EXCEPT

Accepted Answer

A)   Clostridium perfringens.
B)   Yersinia enterocolitica.
C)   Escherichia coli.
D)   Shigella spp.
E)   Salmonella typhi.

Question 2

All of the following infections can result from drinking contaminated water EXCEPT

Accepted Answer

A)   Cyclospora infection.
B)   trichinellosis.
C)   giardiasis.
D)   cryptosporidiosis.
E)   cholera.

Question 3

Poultry products are a likely source of infection by

Accepted Answer

A)   Clostridium perfringens.
B)   Salmonella enterica.
C)   Vibrio cholerae.
D)   Helicobacter pylori.
E)   Shigella spp.

Question 4

Acute gastroenteritis that occurs after an incubation period of two to three days and commonly affects children is probably caused by

Accepted Answer

A)   rotavirus.
B)   Staphylococcus aureus.
C)   Trichinella.
D)   Salmonella.
E)   Giardia.

Question 5

Which of the following statements about staphylococcal food poisoning is FALSE?

Accepted Answer

A)   It can be prevented by adequate refrigeration of food.
B)   It is treated by replacing water and electrolytes.
C)   It is caused by ingesting an enterotoxin.
D)   It can be prevented by heating foods to 50°C for 15 minutes.
E)   It is characterized by rapid onset and short duration of symptoms.

Question 6

A vaccine to provide active immunity to HBV is prepared from

Accepted Answer

A)   viruses grown in embryonated eggs.
B)   pooled gamma globulin.
C)   viruses grown in tissue culture.
D)   viral particles in patients.
E)   genetically modified yeast.

Question 7

Lactic acid, an end product of fructose fermentation, causes breakdown of tooth enamel and, eventually, cavities.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following statements about salmonellosis is FALSE?

Accepted Answer

A)   Severity of disease depends on number of organisms ingested.
B)   A healthy carrier state exists.
C)   It is a bacterial infection.
D)   It is often associated with poultry products.
E)   The mortality rate is high.

Question 9

Aflatoxin poisoning is associated with liver cancer.

Accepted Answer

A) True 
 B)False

Question 10

Helicobacter pylori can grow in the stomach because it

Accepted Answer

A)   makes a capsule.
B)   invades epithelial cells.
C)   hides in macrophages.
D)   makes HCl.
E)   possesses an enzyme that neutralizes HCl.

Question 11

Which of the following is mismatched?

Accepted Answer

A)   shiga toxin - tissue destruction
B)   Vibrio enterotoxin - secretion of Cl-, K+, and H₂O
C)   aflatoxin - liver cancer
D)   ergot - gangrene
E)   Salmonella endotoxin - lyses red blood cells

Question 12

Many bacterial infections of the lower digestive tract are treated with

Accepted Answer

A)   water and electrolytes.
B)   antitoxin.
C)   thorough cooking.
D)   quinacrine.
E)   penicillin.

Question 13

Dental caries can also be referred to as periodontal disease.

Accepted Answer

A) True 
 B)False

Question 14

Approximately 30 percent of the bodyʹs immune system is located in the intestinal tract.

Accepted Answer

A) True 
 B)False

Question 15

What is a Dane particle?

Accepted Answer

A)   the chlorine-resistant virus that causes HAV
B)   the infectious virion that causes HBV
C)   the filamentous particles that cause HAV
D)   another name for an HBV surface antigen
E)   the spherical particles found in serum of patients with HBV

Question 16

ʺRice water stoolsʺ are characteristic of

Accepted Answer

A)   cholera.
B)   tapeworm infestation.
C)   bacillary dysentery.
D)   salmonellosis.
E)   amebic dysentery.

Question 17

Which of the following is directly involved in the initiation of dental caries?

Accepted Answer

A)   dentin
B)   crevicular fluid
C)   lysozyme
D)   sucrose
E)   lactic acid

Question 18

Which of the following correctly lists the stages of tooth decay?

Accepted Answer

A)   plaque accumulation, destruction of enamel, advancement of decay through enamel, decay in dentin, decay in tooth pulp
B)   destruction of enamel, advancement of decay through enamel, plaque accumulation, decay in dentin, decay in tooth pulp
C)   decay in dentin, plaque accumulation, destruction of enamel, advancement of decay through enamel, decay in tooth pulp
D)   plaque accumulation, destruction of enamel, decay in tooth pulp, advancement of decay through enamel, decay in dentin
E)   destruction of enamel, plaque accumulation, advancement of decay through enamel, decay in dentin, decay in tooth pulp

Question 19

Which of the following helminthic diseases is a common infestation found in the southeastern United States?

Accepted Answer

A)   Taenia saginata
B)   Trichuris trichiura
C)   Echinococcus granulosus
D)   Ascaris lumbricoides
E)   Enterobius vermicularis

Question 20

Which one of the following diseases of the gastrointestinal system is transmitted by the respiratory route?

Accepted Answer

A)   travelerʹs diarrhea
B)   mumps
C)   bacillary dysentery
D)   staphylococcal enterotoxicosis
E)   Vibrio gastroenteritis

Exam 25: Microbial Diseases of the Digestive System

Many bacterial infections of the lower digestive tract are treated with

Correct AnswerverifiedShow Answer

Approximately 30 percent of the bodyʹs immune system is located in the intestinal tract.

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All of the following infections can result from drinking contaminated water EXCEPT

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A vaccine to provide active immunity to HBV is prepared from

Correct AnswerverifiedShow Answer

Which of the following statements about staphylococcal food poisoning is FALSE?

Correct AnswerverifiedShow Answer

Which of the following helminthic diseases is a common infestation found in the southeastern United States?

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What is a Dane particle?

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ʺRice water stoolsʺ are characteristic of

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Helicobacter pylori can grow in the stomach because it

Correct AnswerverifiedShow Answer

Acute gastroenteritis that occurs after an incubation period of two to three days and commonly affects children is probably caused by

Correct AnswerverifiedShow Answer

Which of the following is mismatched?

Correct AnswerverifiedShow Answer

Dental caries can also be referred to as periodontal disease.

Correct AnswerverifiedShow Answer

Lactic acid, an end product of fructose fermentation, causes breakdown of tooth enamel and, eventually, cavities.

Correct AnswerverifiedShow Answer

Poultry products are a likely source of infection by

Correct AnswerverifiedShow Answer

Which of the following statements about salmonellosis is FALSE?

Correct AnswerverifiedShow Answer

Aflatoxin poisoning is associated with liver cancer.

Correct AnswerverifiedShow Answer

All of the following are gram-negative rods that cause gastroenteritis EXCEPT

Correct AnswerverifiedShow Answer

Which one of the following diseases of the gastrointestinal system is transmitted by the respiratory route?

Correct AnswerverifiedShow Answer

Which of the following correctly lists the stages of tooth decay?

Correct AnswerverifiedShow Answer

Which of the following is directly involved in the initiation of dental caries?

Correct AnswerverifiedShow Answer

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