Exam 4 Chapter 23

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Exam 4 Chapter 23
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2013-06-18 22:11:39
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Exam 4 Chapter 23
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  1. Which of the following is an organ of the gastrointestinal tract?
    A) the esophagus
    B) the pancreas
    C) the liver
    D) the salivary glands
    E) the gallbladder
    A) the esophagus
    (this multiple choice question has been scrambled)
  2. Where in the digestive tract does the absorption of water take place?
    A) the rectum
    B) the large intestine
    C) the esophagus
    D) the stomach
    E) the small intestine
    B) the large intestine
    (this multiple choice question has been scrambled)
  3. Which of the following is a fungus which commonly lives in the large intestine?
    A) Candida
    B) Escherichia
    C) Lactobacillus
    D) Bacteroides
    E) Campylobacter
    A) Candida
    (this multiple choice question has been scrambled)
  4. Streptococcus mutans is associated with
    A) dental caries
    B) food poisoning
    C) severe diarrhea
    D) periodontitis
    E) typhoid fever
    A) dental caries
    (this multiple choice question has been scrambled)
  5. Porphyromonas gingivalis is associated with
    A) perodontitis
    B) typhoid fever
    C) gastroenteritis
    D) food poisoning
    E) hepatitis
    A) perodontitis
    (this multiple choice question has been scrambled)
  6. Which of the following is now known to be the cause of most peptic ulcers?
    A) Shigella dysenteriae
    B) Salmonella enterica
    C) Escherichia coli O157:H7
    D) Helicobacter pylori
    E) Vibrio cholerae
    D) Helicobacter pylori
    (this multiple choice question has been scrambled)
  7. Urease is an important virulence factor of which of the following?
    A) Vibrio cholerae
    B) Shigella dysenteriae
    C) Escherichia coli O157:H7
    D) Helicobacter pylori
    E) Porphyromonas gingivalis
    D) Helicobacter pylori
    (this multiple choice question has been scrambled)
  8. The most important virulent factor of Vibrio cholerae is
    A) its activation of certain genes within the human body
    B) its ability to form biofilms in saltwater
    C) the presence of polar flagella
    D) its ability to produce a potent exotoxin
    E) its ability to survive in freshwater
    D) its ability to produce a potent exotoxin
    (this multiple choice question has been scrambled)
  9. The major symptoms of cholera are attributable to which of the following?
    A) activity of a type III secretion system
    B) cessation of protein synthesis in host cells
    C) production of urease
    D) activation of adenylate cyclase
    E) death of cells lining the intestinal tract
    D) activation of adenylate cyclase
    (this multiple choice question has been scrambled)
  10. Which of the following serotypes of Salmonella enterica causes most cases of human salmonellosis in the United States?
    A) Paratyphi
    B) both Enteritidis and Typhimurium
    C) Enteritidis
    D) Typhi
    E) Typhimurium
    B) both Enteritidis and Typhimurium
    (this multiple choice question has been scrambled)
  11. Which of the following is a defining characteristic of coliforms?
    A) They ferment lactose
    B) They are never pathogenic
    C) They are found in the intestinal tracts of human and animals
    D) They are Gram-positive bacilli
    E) They are strictly anaerobic
    A) They ferment lactose
    (this multiple choice question has been scrambled)
  12. Escherichia. coli O157:H7 is primarily associated with which of the following foods?
    A) dairy products
    B) eggs
    C) fomites
    D) ground beef
    E) pork
    D) ground beef
    (this multiple choice question has been scrambled)
  13. The most common cause of traveler's diarrhea is
    A) Escherichia coli
    B) Giardia intestinalis
    C) Cryptosporidium parvum
    D) Shigella flexneri
    E) Salmonella enterica
    A) Escherichia coli
    (this multiple choice question has been scrambled)
  14. Shigellosis can be differentiated from salmonellosis by the fact that Shigella
    A) multiplies in the host cell's cytosol
    B) causes severe diarrhea, abdominal cramps, and fever
    C) stimulates intestinal epithelial cells to phagocytize it
    D) kills host cells
    E) multiplies in phagocytic vesicles
    A) multiplies in the host cell's cytosol
    (this multiple choice question has been scrambled)
  15. The most common bacterial cause of diarrhea that sends people to doctors in the United States is
    A) Vibrio
    B) Campylobacter
    C) Staphylococcus
    D) Escherichia
    E) Salmonella
    B) Campylobacter
    (this multiple choice question has been scrambled)
  16. A young woman being treated for serious burns develops severe diarrhea accompanied by intense abdominal pain. She passes several watery, foul-smelling, bloody stools a day. A colonoscopy reveals patches of yellowish lesions in the large intestine. The probably causative agent is
    A) Salmonella enterica serotype Typhi
    B) Vibrio cgikerae
    C) Campylobacter
    D) Giardia intestinalis
    E) Clostridium difficile
    E) Clostridium difficile
    (this multiple choice question has been scrambled)
  17. The common source of contamination in the majority of cases of staphylococcal food poisoning (intoxication) is
    A) contaminated water
    B) fecal contamination
    C) the skin of food preparers
    D) dairy products
    E) eggs
    C) the skin of food preparers
    (this multiple choice question has been scrambled)
  18. Which of the following statements is TRUE with regard to oral herpes?
    A) Ninety percent of all cases are caused by human herpesvirus 2 (HHV-2)
    B) Lesions become more severe with each recurrence.
    C) Lesions can be triggered by emotional stress or physiologic changes.
    D) There is an effective cure for oral herpes
    E) Primary infections are usually characterized by severe lesions.
    C) Lesions can be triggered by emotional stress or physiologic changes.
    (this multiple choice question has been scrambled)
  19. Which of the following is the major sign or symptom of mumps?
    A) nausea and vomiting
    B) parotitis
    C) deafness
    D) darrhea
    E) difficulty in breathing
    B) parotitis
    (this multiple choice question has been scrambled)
  20. The viruses responsible fo the majority of infant deaths resulting from diarrhea in the world are the 
    A) hepaciviruses
    B) caliciviruses
    C) astroviruses
    D) noroviruses
    E) rotaviruses
    E) rotaviruses
    (this multiple choice question has been scrambled)
  21. Which of the following hepatitis viruses usually produces subclinical infections?
    A) HCV
    B) HBV
    C) HAV
    D) HDV
    E) HEV
    A) HCV
    (this multiple choice question has been scrambled)
  22. The intracellular parasite usually acquired in contaminated drinking water which causes a persistent watery diarrhea is 
    A) norovirus
    B) Cryptosporidium parvum
    C) Vibrio cholerae
    D) hepatitis A virus
    E) Entamoeba histolytica
    B) Cryptosporidium parvum
    (this multiple choice question has been scrambled)
  23. Which of the following conditions usually results in severe acute liver damage?
    A) superinfection with hepatitis A and hepatitis E viruses
    B) superinfection with hepatitis B and hepatitis delta viruses
    C) co-infection with hepatitis B and hepatitis delta viruses
    D) co-infection with hepatitis A and hepatitis B viruses
    E) co-infection with hepatitis B and hepatitis C viruses
    C) co-infection with hepatitis B and hepatitis delta viruses
    (this multiple choice question has been scrambled)
  24. A vaccine is available against which of the following?
    A) hepatitis B
    B) hepatitisi A, B, and C
    C) hepatitis A
    D) both hepatisis A and hepatitis B
    E) hepatitis C
    D) both hepatisis A and hepatitis B
    (this multiple choice question has been scrambled)
  25. Of the following, who is most likely to develop a chronic infection with hepatitis B virus?
    A) young adults
    B) the elderly
    C) newborns
    D) children between the ages of 2 and 12
    E) females at puberty
    C) newborns
    (this multiple choice question has been scrambled)
  26. A man reports to his doctor that he is tired all the time and his urine has become darker in color. He has not experienced fever or vomiting recently. The physician notes that his eyes are yellowing and his abdomen is swollen. The man has a history of kidney transplant and recently returned from an overseas trip. The man may be infected with
    A) Shigella
    B) Entamoeba histolytica
    C) norovirus
    D) hepatitis C virus
    E) hepatitis E virus
    E) hepatitis E virus
    (this multiple choice question has been scrambled)
  27. Diagnosis of hepatitis B infection is made by the observation of which of the following in the patient's body fluids?
    A) O antigens
    B) enterotoxins
    C) endospores
    D) Dane particles
    E) oocysts
    D) Dane particles
    (this multiple choice question has been scrambled)
  28. Which of the following is a notable symptom of giardiasis?
    A) cold sores
    B) jaundice
    C) foul-smelling "rotten egg" stools
    D) "rice-water" stools
    E) irritability and sleep disturbance
    C) foul-smelling "rotten egg" stools
    (this multiple choice question has been scrambled)
  29. Which of the following causes "beaver fever?"
    A) Enterobius vermicularis
    B) Taenia saginata
    C) Entamoeba histolytica
    D) Giardia intestinalis
    E) Campylobacter jejuni
    D) Giardia intestinalis
    (this multiple choice question has been scrambled)
  30. Which of the following statements is TRUE with regard to Entamoeba histolytica?
    A) it causes a form of hepatitis
    B) it is an intracellular parasite
    C) it causes pseudopodia to attach to the intestinal lining
    D) it reproduces by schizogony
    E) an effective vaccine against infection is available
    C) it causes pseudopodia to attach to the intestinal lining
    (this multiple choice question has been scrambled)
  31. Where in a tapeworm would you expect to find fertilized eggs?
    A) the neck region of the strobila
    B) outside the cuticle
    C) at the end of the strobila
    D) inside the scolex
    E) in all proglottids
    C) at the end of the strobila
    (this multiple choice question has been scrambled)
  32. Tapeworms are usually transmitted to humans through ingestion of
    A) tapeworm larvae
    B) mature tapeworms
    C) gravid proglottids
    D) cysticerci
    E) tapeworm eggs
    D) cysticerci
    (this multiple choice question has been scrambled)
  33. Differentiation between Taenia saginata and Taenia solium is carried out via examination of the
    A) larvae
    B) cysticerci
    C) scolex
    D) eggs
    E) proglottids
    C) scolex
    (this multiple choice question has been scrambled)
  34. Which of the following is a common childhood parasite in the United States?
    A) Taenia solium
    B) Giardia intestinalis
    C) Entamoeba histolytica
    D) Cryptosporidium parvum
    E) Enterobius vermicularis
    E) Enterobius vermicularis
    (this multiple choice question has been scrambled)
  35. What is the primary symptom of Enterobius infections?
    A) vomiting and nausea
    B) bloody diarrhea
    C) liver enlargement
    D) intestinal blockage
    E) perianal itching
    E) perianal itching
    (this multiple choice question has been scrambled)
  36. A large number of people in a community experience diarrhea with fever. Public health authorities investigate and find that the people are passing dark urine, and some have yellowish skin. Furthermore, all of the affected individuals recently ate at a new restaurant in town known for its wide variety of fresh imported vegetables. Which of the following is the most likely causative agent?
    A) norovirus
    B) hepatitis A virus
    C) Escherichia coli O157:H7
    D) Salmonella enterica
    E) hepatitis E virus
    B) hepatitis A virus
    (this multiple choice question has been scrambled)
  37. The DNA virus known as "serum hepatitis" is
    A) HBV
    B) HDV
    C) HAV
    D) HCV
    E) HEV
    A) HBV
    (this multiple choice question has been scrambled)
  38. Peritonitis may develop in severe cases of
    A) typhoid
    B) giardiasis
    C) pinworm infestation
    D) peptic ulcer disease
    E) hepatitis
    A) typhoid
    (this multiple choice question has been scrambled)
  39. What member of the human intestinal microbiota occasionally causes life-threatening disease?
    A) Escherichia coli O157:H7
    B) Clostridium difficile
    C) Giardia intestinalis
    D) Salmonella enterica
    E) Lactobacilus
    B) Clostridium difficile
    (this multiple choice question has been scrambled)
  40. Accessory organ infections are caused by
    A) rotavirus
    B) human herpesvirus 1
    C) enterovirus
    D) mumps virus
    E) norovirus
    D) mumps virus
    (this multiple choice question has been scrambled)
  41. Cholera toxin is composed of five A subunits and one B subunit
    A) True
    B) False
    B) False
  42. Salmonella is part of the normal microbiota of virtually all vertebrates except humans.
    A) True
    B) False
    A) True
  43. Cholera toxin is composed of five A subunits and one B subunit.
    A) True
    B) False
    B) False
  44. All tapeworms are intestinal parasites that completely lack digestive systems
    A) True
    B) False
    A) True
  45. omplete recovery from hepatitis A infection occurs 99% of the time.
    A) True
    B) False
    A) True
  46. Vomiting is a common sign of viral gastroenteritis.
    A) True
    B) False
    B) False
  47. Peptic ulcers are erosions of the lining of the small or large intestines.
    A) True
    B) False
    B) False
  48. Dysentery is a severe type of gastroenteritis in which stools contain mucus and blood.
    A) True
    B) False
    A) True
  49. Supportive care is the only treatment for staphylococcal food poisoning.
    A) True
    B) False
    A) True
  50. Contamination of meat with tapeworm cysts can be detected by visual inspection.
    A) True
    B) False
    A) True

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