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Multiple Choice Quiz
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1
The gastrointestinal tract can be thought of as a long tube. Identify the organ that is NOT part of the gastrointestinal tract.
A)mouth
B)anus
C)pancreas
D)duodenum
2
The greatest concentration of microorganisms in the gastrointestinal tract are found
A)in the stomach.
B)on the teeth.
C)in the small intestine.
D)in the large intestine.
3
Which of the following immunological defenses is common to the oral cavity, the upper GI tract, and the lower GI tract?
A)IgA
B)lysozyme
C)low pH
D)bile
4
The gut-associated lymphoid tissue (GALT) consists of all the following EXCEPT
A)tonsils & adenoids.
B)Peyer's patches.
C)appendix.
D)gallbladder.
5
The incidence of dental caries is associated with
A)amount of carbohydrate consumed.
B)hygiene practices.
C)host genetic factors.
D)all of the above.
6
Gingivitis is the initial stage of
A)dental caries.
B)periodontitis.
C)ulcers.
D)gastritis.
7
The paramyxovirus which causes mumps evades immune response by
A)having blood type O antigen on its surface.
B)forming syncytia and moving cell to cell.
C)infecting lymphocytes.
D)antigen switching.
8
Swelling of the salivary glands in mumps is called
A)parotitis.
B)periodontitis.
C)salivitis.
D)granuloma.
9
Salmonella variants cause all the following EXCEPT
A)salmonellosis.
B)typhoid fever.
C)gastroenteritis.
D)typhus.
10
Gastritis and gastric ulcers are caused primarily by
A)Helicobacter infection.
B)Staphylococcus infection.
C)high sugar diet & spicy foods.
D)psychological stress.
11
Enterohemorrhagic E.coli, or EHEC, can cause all the following EXCEPT
A)hemolytic uremic syndrome.
B)dysentery.
C)gastroenteritis with fever.
D)hepatocarcinoma.
12
Short incubation period, "rice-water" stools, and copious watery diarrhea are the hallmark of infection by this organism, which kills up to half of untreated patients.
A)Clostridium difficile
B)Vibrio cholerae
C)Yersinia entercolitica
D)Cryptosporidium
13
"Food poisoning" should be suspected with persons who shared food within the previous 1-6 hours, and share the signs and symptoms of nausea, vomiting, and diarrhea. Typically, this is due to
A)infection.
B)emetics.
C)intoxication.
D)inebriation.
14
___________ does NOT produce an exotoxin as a virulence factor.
A)Salmonella
B)Shigella
C)E. coli O157:H7
D)Campylobacter
15
Identify the hepatitis that can lead to cancer.
A)hepatitis A
B)hepatitis B
C)hepatitis D
D)hepatitis E
16
The most common flagellated protozoan isolated in clinical specimens is
A)Cyclospora cayetanensis
B)Giardia lamblia
C)Vibrio cholerae
D)Entamoeba histolytica
17
The most common worm disease of children in temperate zones is
A)tapeworm.
B)fluke.
C)pinworm.
D)hookworm.
18
Some antihelminthic therapeutic agents (ATA) work by
A)paralyzing the worm so it can be expelled in the feces.
B)increasing the worm's metabolism.
C)increasing ATP formation in the worm.
D)destroying the eggs.
19
Flukes tend to have a complex life cycle, using ___________ to complete the life cycle.
A)infective cysts
B)intermediate hosts
C)terminal hosts
D)sexual reproduction
20
Schistosomiasis has several unique characteristics, including
A)shedding eggs into the bile duct and use of snails as part of the life cycle.
B)being able to see tracks of burrowing worms under the skin and its tiny size.
C)absorbing vitamin B12 and making it unavailable to the host, causing anemia.
D)the ability to burrow into intact skin and coating itself with host blood proteins.
21
______ is an inflammatory disease marked by necrosis of liver cells and a mononuclear response that swells and disrupts the liver.
A)Cholera
B)Hepatitis
C)Periodontitis
D)Giardiasis
22
Identify the worm whose larvae hatch outside the body in soil contaminated with feces, and then infect the host by penetrating the skin.
A)tapeworm
B)hookworm
C)pinworm
D)all of the above
23
The stomach is sterile and has no normal flora.
A)True
B)False
24
Dental caries is the most common infectious disease of human beings.
A)True
B)False
25
In the absence of dietary carbohydrates, bacteria do not cause tooth decay.
A)True
B)False
26
Humans are the exclusive natural hosts for the mumps virus.
A)True
B)False
27
It is estimated that one out of every five chickens destined for human consumption is contaminated with Salmonella.
A)True
B)False
28
Eosinophilia is a hallmark of helminth infection.
A)True
B)False
29
Diarrhea containing blood and mucus is also called dysentery.
A)True
B)False
30
Campylobacter is the most common cause of bacterial diarrhea in the United States.
A)True
B)False
31
Salmonella enterica is the main pathogen of salmonellosis.
A)True
B)False
32
Treatment for EHEC does not include antibiotic therapy.
A)True
B)False
33
All E.coli variants cause disease.
A)True
B)False







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