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MTAP 2 - PARASITOLOGY > BOC Study Guide (CHAPTER REVIEW) > Flashcards

BOC Study Guide (CHAPTER REVIEW) Flashcards

1
Q
  1. Artifacts found in a stool specimen that can be confused with ova or cyst are:

A. partially digested meat fibers
B. degenerated cells from the gastrointestinal mucosa
C. dried chemical crystals
D. pollen grains

A

D. pollen grains

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2
Q
  1. Polyvinyl alcohol used in the preparation of permanently stained smears of fecal material:

A. concentrated eggs
B. dissolves artifacts
C. serves as an adhesive
D. enhances stain penetration

A

C. serves as an adhesive

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3
Q
  1. A method to culture Acanthamoeba species from corneal ulcer scrapings is to inoculate

A. McCoy cells
B. Novy, MacNeal and Nicolle (NNN) medium
C. an agar plate overlaid with Escherichia coli
D. Regan-Lowe medium

A

C. an agar plate overlaid with Escherichia coli

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4
Q
  1. Primary amoebic encephalitis is caused by:

A. Entamoeba coli
B. Dientamoeba fragilis
C. Endolimax nana
D. Naegleria fowleri

A

D. Naegleria fowleri

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5
Q
  1. A formed stool is received in the laboratory at 10:30PM for ova and parasite exam. The night shift technologist is certain that the
    workload will prevent the examination of specimen until 7AM when the next shift arrives. The technologist should:

A. request that a new specimen be collected after 7AM
B. hold the specimen at room temperature
C. examine a direct prep for trophozoites and freeze the
remaining specimen
D. preserve the specimen in formalin until it can be examined

A

D. preserve the specimen in formalin until it can be examined

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6
Q
  1. The advantage of thick blood smears for malarial parasites is to:

A. improve staining of the organisms
B. improve detection of the organisms
C. remove RBC artifacts
D. remove platelets

A

B. improve detection of the organisms

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7
Q
  1. This parasite is transmitted by accidental ingestion of cat feces that contain oocysts and by ingestion of undercooked meat that has tissue cysts. The parasite is:

A. Cryptosporidium parvum
B. Cyclospora cayetanensis
C. Toxoplasma gondii
D. Trypanosoma cruzi

A

C. Toxoplasma gondii

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8
Q
  1. A 44-year-old man is admitted to the hospital following a 2-week history of low-grade fever, malaise, and anorexia. Examination of a Giemsa stain reveals many intraerythrocytic parasites. Further history reveals frequent camping trips near Martha’s Vineyard and Nantucket Island, but no travel outside the continental United States. This parasite can be easily confused
    with:

A. Trypansoma cruzi
B. Trypanosoma rhodesiense/gambiense
C. Plasmodium falciparum
D. Leishamania donovani

A

C. Plasmodium falciparum

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9
Q
  1. A Wright-stained peripheral smear reveals the following:
    ● Erythrocytes enlarged ½ to 2x normal size
    ● Schüffner dots
    ● Parasites with irregular “spread out” trophozoites,
    golden-brown pigment
    ● 12-24 merozoites
    ● Wide range Stages

This is consistent with Plasmodium:

A. falciparum
B. malariae
C. ovale
D. vivax

A

D. vivax

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10
Q
  1. A patient is suspected of having amoebic dysentery. Upon microscopic examination of a fresh fecal specimen for ova and
    parasites, the data shown are obtained:
    ● a trophozoite of 25 μm
    ● progressive, unidirectional crawl
    ● evenly distributed peripheral chromatin
    ● finely granular cytoplasm

This information indicates:

A. Entamoeba coli
B. Entamoeba histolytica
C. Endolimax nana
D. Iodamoeba bütschlii

A

B. Entamoeba histolytica

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11
Q

Trophozoites of the cyst shown in the image are likely to:

A. contain red blood cells
B. have clear, pointed pseudopodia
C. contain few, if any, vacuoles
D. have slow, undefined motility

A

D. have slowed, undefined motility

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12
Q
  1. Which organisms are shown together in the image?

A. Entamoeba histolytica and Entamoeba hartmanni
B. Dientamoeba fragilis and Entamoeba histolytica
C. Giardia lamblia and Entamoeba coli
D. Entamoeba coli and Entamoeba histolytica

A

A. Entamoeba histolytica and Entamoeba hartmanni

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13
Q
  1. Upon finding the organism show in a fecal concentrate, the technologist should:

A. immediately telephone the report of this pathogen to the physician
B. review the fecal concentration carefully for the presence of other microorganisms that may be pathogenic
C. look for motile trophozoites
D. request a new specimen because the presence of excessive pollen grains

A

B. review the fecal concentration carefully for the presence of other microorganisms that may be pathogenic

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14
Q
  1. This structure on the right in the image depicts a:

A. cyst of a nonpathogenic amoeba
B. trophozoite of a nonpathogenic amoeba
C. cyst of a pathogenic amoeba
D. trophozoite of a pathogenic amoeba

A

A. cyst of a nonpathogenic amoeba

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15
Q
  1. The organism shown in the image is a(n):

A. cyst of a nonpathogenic amoeba
B. trophozoite of a nonpathogenic amoeba
C. cyst of a pathogenic amoeba
D. trophozoite of a pathogenic amoeba

A

B. trophozoite of a nonpathogenic amoeba

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15
Q
  1. A 24-year-old woman, who just returned from vacationing in Lebanon, becomes ill with diarrhea. The organism shown in the image are found in her stool. The patient most likely is suffering from:

A. giardiasis
B. amebiasis
C. ascariasis
D. balantidiasis

A

A. giardiasis

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16
Q
  1. A liquid stool specimen is collected at 10:00PM and brought to the laboratory for culture and ova and parasite examination. It is
    refrigerated until 10:10AM the next day, when the physician requests that the technologist look for amoebic trophozoites. The best course of action would be to:

A. request a fresh specimen
B. perform a concentration of the original specimen
C. perform a trichrome stain on the original specimen
D. perform a saline wet mount on the original specimen

A

A. request a fresh specimen

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17
Q
  1. Small protozoan cyst are found in a wet mount of sediment from ethyl-acetate concentrated material. Each cyst has 4 nuclei
    that do not have peripheral chromatin, and each nucleus has a large karyosome, which appears as a refractive dot. These oval
    cysts are most likely:

A. Endolimax nana
B. Chilomastix mesnili
C. Entamoeba histolytica
D. Entamoeba hartmanni

A

A. Endolimax nana

18
Q
  1. The term “internal autoinfection” is generally used in referring to infections with:

A. Ascaris lumbricoides
B. Necator americanus
C. Trichuris trichiura
D. Strongyloides stercoralis

A

D. Strongyloides stercoralis

19
Q
  1. A fibrous skin nodule is removed from the back of a patient for Central America. A microfilaria is seen upon microscopic exam of the nodule is most likely:

A. Wuchereria bancrofti
B. Brugia malayi
C. Onchocerca volvulus
D. Loa loa

A

C. Onchocerca volvulus

20
Q
  1. The egg shown in the image is most likely to be found in children suffering from: (ENTEROBIOUS VERMICULARIS)

A. diarrhea
B. constipation
C. perianal itching
D. stomach pain

A

C. perianal itching

21
Q
  1. The specimen of choice for finding the parasite shown in the image is: (ENTEROBIOUS VERMICULARIS)

A. stool
B. duodenal washing
C. rectal swab
D. scotch tape preparation

A

D. scotch tape preparation

22
Q
  1. The causative agent of cysticercosis is:

A. Taenia solium
B. Taenia saginata
C. Ascharis lumbricoides
D. Trichuris trichiura

A

A. Taenia solium

23
Q
  1. Human feces is not a recommended specimen in the detection of:

A. Strongyloides stercoralis
B. Entamoeba histolytica
C. Echinococcus granulosus
D. Ancylostoma duodenale

A

C. Echinococcus granulosus

24
Q
  1. Organisms that can be easily identified to the species level from the ova in fecal specimens include:

A. Metagonimus yokogawai, Heterophyes heterophyes
B. Taenia solium, Taenia saginata
C. Necator americanus, Ancylostoma duodenale
D. Paragonimus westermani, Hymenolepis nana

A

D. Paragonimus westermani, Hymenolepis nana

25
Q
  1. The preferred specimen for the diagnosis of paragonimiasis is:

A. bile drainage
B. blood smear
C. skin snips
D. sputum

A

D. sputum

26
Q
  1. A stool specimen for ova and parasite examination contained numerous rhabditiform larvae. Which factor(s) aid in the identification of larvae?

A. larva tail nuclei and presence of sheath
B. length of buccal cavity and appearance of genital primordium
C presence of hydatid cysts
D. prominent kinetoplasts in trypomastigote

A

B. length of buccal cavity and appearance of genital primordium

27
Q
  1. Which one of the following routine tests for Entamoeba histolytica has the highest sensitivity and specificity?

A. colonic ulcer biopsy
B. stool microscopy
C. stool EIA
D. urine PCR

A

C. stool EIA

28
Q
  1. Which characteristic will identify Iodamoeba bütschlii?

A. nuclei in mature cyst
B. small (5-10 μm) size
C. prominent vacuole in cyst form
D. presence of up to 8 nuclei in the cyst form

A

C. prominent vacuole in cyst form

29
Q
  1. What is the principal means of distinguishing Entamoeba histolytica from Entamoeba hartmanni by light microscope?

A. size of trophozoite
B. appearance of karyosome
C appearance of nuclear chromatin
D. number of nuclei in cyst form

A

A. size of trophozoite

30
Q
  1. The only medically significant ciliate organism is:

A. Acanthamoeba
B. Balantidium coli
C Cryptosporidium parvum
D. Chilomastix mesnili

A

B. Balantidium coli

31
Q
  1. Where do Plasmodium sporozoites proliferate?

A. bone marrow
B. liver
C red blood cells
D. nucleated erythrocyte precursors

A

B. liver

32
Q
  1. Individuals who lack the Duffy antigen on the surface of the red blood cells are protected against which species of
    Plasmodium?

A. P. vivax
B. P. falciparum
C P. malariae
D. P. ovale

A

A. P. vivax

33
Q
  1. Which nematodes produce eggs with characteristic hyaline polar plugs at each end, as in the image?

A. Ascaris lumbricoides
B. Necator americanus
C Strongyloides stercoralis
D. Trichuris trichiura

A

D. Trichuris trichiura

34
Q
  1. Which nematodes has a characteristic mamillated bile-stained egg, as in the image?

A. Ascaris
B. Necator
C Strongyloides
D. Trichuris

A

A. Ascaris

35
Q
  1. Which organism is predominantly responsible for visceral larva migrans?

A. Ancylostoma braziliensis
B. Onchocerca volvulus
C Toxocara canis
D. Trypanosoma brucei

A

C Toxocara canis

36
Q
  1. Which organism has the largest egg?

A. Clonorchis
B. Diphyllobothrium
C Fasciola
D. Paragonimus

A

C Fasciola

37
Q
  1. The eggs of which species of Schistosoma can be isolated from urine?
    A. S. haematobium
    B. S. japonicum
    C S. mansoni
    D. S. sterooralis
A

A. S. haematobium

38
Q
  1. Which one of the following features of Taenia saginata helps distinguish it from T. solium?

A. egg with a radially striated wall
B. pork tapeworm
C proglottid with <13 uterine branches
D. unarmed rostellum

A

D. unarmed rostellum

39
Q
  1. Infection by this organism can cause of B12 deficiency:

A. Diphyllobothrium latum
B. Echinococcus granulosus
C Taenia solium
D. Schistosoma manson

A

A. Diphyllobothrium latum

40
Q
  1. This organism is responsible for hydatid cysts of the liver:

A. Diphyllobothrium
B. Echinococcus
C Hymenolepis
D. Trichomonas

A

B. Echinococcus

41
Q
  1. How is Trichomonas vaginalis transmitted?

A. ingestion of cyst stage
B. ingestion of trophozoite stages
C larval stage burrows through the skin
D. Sexual contact

A

D. Sexual contact

42
Q
  1. This parasite has the following characteristics:
    ● Banana shaped gametocytes in RBCs
    ● Multiple ring forms in RBCs
    ● All Rbcs are infected

The identification of the parasite is:

A. Plasmodium falciparum
B. Plasmodium malariae
C Plasmodium ovale
D. Plasmodium vivax

A

A. Plasmodium falciparum

43
Q
  1. This parasite has the following characteristics:
    ● Stains red with acid-fast stain
    ● Zoonotic transfer to humans
    ● Spread by fecal-oral route

The most likely organism is:

A. Cryptosporidium
B. Giardia
C Naegleria fowleri
D. Necator

A

A. Cryptosporidium

MTAP 2 - PARASITOLOGY (4 decks)

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