Enteric Flagellates, Coccidia And Hemoflagellates

27 Questions | Total Attempts: 61

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Enteric Flagellates, Coccidia And Hemoflagellates

Enteric flagella , hemoflagellates and coccidia review


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Questions and Answers
  • 1. 
    The Subphylum Apicomplexa contains a huge array of parasitic organisms sometimes referred to as sporozoans.  Gametogeny is on of the reproductive processes exhibited by these parasites.  The reproductive process that immediately follows gametogeny is ______ and in the case of malarial parasites this process occurs ________.
    • A. 

      Schizogony/ in erythrocytes of mammalian intermediate host

    • B. 

      Endodyogeny/ in erythrocytes of the mammalian intermediate host

    • C. 

      Merogony/ on the outside of the stomach of the arthropod definitive host

    • D. 

      Sporogony/ in macrophages of the mammalian intermediate host

    • E. 

      Sporogony. on the outside of the stomach of the arthropod definitive host

  • 2. 
    Balantidium coli observed in stained fecal smears are easily distinguished from protozoa of other subphyla by the presence of _______ and _________.
    • A. 

      Numerous conspicious cilia/ a kidney shaped macronucleus

    • B. 

      The large thick-walled cyst stage/ an undulating membrane

    • C. 

      Cilia covering the entire body/ a kidney-shaped micronucleus

    • D. 

      Psuedopodia/ a vesicular nucleus

    • E. 

      A kidney shaped macronucleus/ its extremely small size

  • 3. 
    The statement, ___________, accurately applies to the human parasite Trichomonas vaginalis and the bovine parasite Tritrichomonas foetus.
    • A. 

      All trichomonad species use arthropods as intermediate hosts

    • B. 

      All trichomonads species have direct life cycles and some are sexually transmitted

    • C. 

      Some trichomonad species have indirect life cycles and reproduce by binary fission

    • D. 

      Trichomonad species sexually reproduce in their intermediate hosts

    • E. 

      Some trichomonad species have direct life cycles and reproduce by schizogony

  • 4. 
    Birds become infected with the protozoan parasite Histomonas meleagridis by _________.
    • A. 

      Ingestion of infected chicken livers

    • B. 

      Ingestion of larvated eggs of Heterakis gallinarum in which the larvae are infected with the protozoan

    • C. 

      Ingestion of earthworms acting as a transport or paratenic hosts for protozoan-infected Heterakis gallinarum

    • D. 

      Answers a, b, and c are all correct, making d the answer

    • E. 

      Only answers b and c are correct, making e the answer

  • 5. 
    Of the hemoflagellates listed below, only ____________ is transmitted in the contaminated feces of infected arthropod vector (stercorarian transmission) subsequent introduction of parasites to mucous membranes or skin abrasions.
    • A. 

      Trypanosoma cruzi

    • B. 

      Trypanosoma brucei brucei

    • C. 

      Trypanosoma rhodesiense

    • D. 

      Trypanosoma brucei gambiense

    • E. 

      Leishmania donovani

  • 6. 
    The life cycle of he enteric amebas Entamoeba histolytica is characterized as being ___________.
    • A. 

      Indirect utilizing an arthropod intermediate host

    • B. 

      Indirect by ingestion of contaminated water

    • C. 

      Indirect and/or utilizing a paratenic host

    • D. 

      Direct within a protective cyst

    • E. 

      Direct as a trophozoite

  • 7. 
    Of the parasites in the following list only ____________ is not a member of the Subphylum Apicomplexa?
    • A. 

      Babesia canis

    • B. 

      Plasmodium vivax

    • C. 

      Toxoplasma gondii

    • D. 

      Trypanosoma evansi

    • E. 

      Cryptosporidium parva

  • 8. 
    Balantidium coli has limited veterinary medical importance, however, it sometimes produces clinical disease in _______ and ______.
    • A. 

      Cats/ dogs

    • B. 

      Pigs/ cats

    • C. 

      Horses/ dogs

    • D. 

      Snakes/ fish

    • E. 

      Dogs/ pigs

  • 9. 
    Toxoplasma gondii can be transmitted by ____________ and _________?
    • A. 

      Ingestion of a sporulated oocyst/ ingestion of tachyzoites in animal tissues

    • B. 

      Ingestion of tachyzoites in animal tissue/ transplacental transfer to a fetus

    • C. 

      Ingestion of bradyzoites ("cysts") in animal tissues/ ingestion of a sporulated oocyst

    • D. 

      Transplacental transfer to a fetus/ ingestion of bradyzoites ("cysts") in animal tissue

    • E. 

      All the above are correct, making "e" the answer

  • 10. 
    Sarcocystis have an obligatory two-host life cycle with carnivores serving as the definitive host.  In this type of coccidian the tissue stages infective for the definitive host are found in the _____________ of the intermediate host.
    • A. 

      Intestinal mucosa

    • B. 

      Feces

    • C. 

      Muscles

    • D. 

      All the above are correct, making "d" the answer

    • E. 

      None of the above is correct, making "e" the answer

  • 11. 
    The pathologic conditions caused by Sarcocystic neurona, causative agent of equine protozoal myeloencephalitis (EPM), are related to ________________.
    • A. 

      The presence of the oocysts in neurologic tissues

    • B. 

      Localized inflammatory reactions around cysts containing bradyzoites in the brain and/or spinal cord

    • C. 

      Sarcocysts in striated muscles

    • D. 

      Toxins produced by oocysts in the intestinal epithelium

    • E. 

      Localized inflammatory reactions around oocysts in the spinal cord

  • 12. 
    Hepatozoon americanum differs from other tick-borne protozoal diseases studied in that ___________.
    • A. 

      It is found only in dogs from Oklahoma

    • B. 

      It is transovarially transmitted within the tick

    • C. 

      Tick transmission is strictly mechanical

    • D. 

      The trophozoites are transmitted in the saliva of infected ticks

    • E. 

      Infection is initiated in dogs by ingestion of a tick containing oocysts and sporozoites

  • 13. 
    Apicomplexan parasites that only infect the erythrocytes of mammalian hosts are ____________.
    • A. 

      Babesia

    • B. 

      Theileria

    • C. 

      Plasmodium

    • D. 

      Haemoproteus

    • E. 

      Cytauxzoon

  • 14. 
    Two genera of enteric protozoa of the Subphylum Sarcomastigophora diagnosed by finding cyst stages in smears of formed fecal stools are __________ and ___________.
    • A. 

      Entamoeba/ Tritrichomonas

    • B. 

      Giardia/ Trichomonas

    • C. 

      Giardia/ Entamoeba

    • D. 

      Trichomonas/ Naegleria

    • E. 

      Isospora/ Trichomonas

  • 15. 
    The statement that "all are _____________" is true for all species of Babesia?
    • A. 

      Transmitted by ingestion of ticks

    • B. 

      Extraerythrocytic parasites

    • C. 

      Transovarially transmitted in ticks

    • D. 

      All the above are correct

    • E. 

      None of the above are correct

  • 16. 
    What is the vector for Texas cattle fever caused by Babesia bigemina?
    • A. 

      Mosquitoes

    • B. 

      Ticks

    • C. 

      Lice

    • D. 

      Flies

    • E. 

      None of the above

  • 17. 
    In diagnosis of Ehrlichia ewingii in dogs one finds ___________ in _________  in examination of stained blood films.
    • A. 

      Piroplasms/ erythrocytes

    • B. 

      Morulae/ platelets

    • C. 

      Morulae/ granulocytic leukocytes

    • D. 

      Morulae/ agranulocytic leukocytes

    • E. 

      Meronts/ muscle cells

  • 18. 
    Ticks do not transmit ____________ to dogs?
    • A. 

      Rickettsia rickettsii

    • B. 

      Trypanosoma cruzi

    • C. 

      Babesia canis

    • D. 

      Borrelia burgdorferi

    • E. 

      Ehrlichia canis

  • 19. 
    The rickettsial agent for which an effective vaccine was developed at Oklahoma State University is _______.
    • A. 

      Anaplasma marginale

    • B. 

      Ehrilchia canis

    • C. 

      Ehrlichia ewingii

    • D. 

      Cowdria ruminatum

    • E. 

      All of the above

  • 20. 
    Neorickettsia helminthoeca, the cause of "salmon poisoning disease" in dogs, is transmitted by the digean trematode, __________, that uses __________ as an intermediate host.
    • A. 

      Echinostoma revolutum/ a fish

    • B. 

      Nanophyetus/ a fish

    • C. 

      Alaria marcianae/ a frog

    • D. 

      Eurytrema pancreaticum/ an arthropod

    • E. 

      None of the above

  • 21. 
    Anaplasma marginale is a rickettsial agent found in ____________ of cattle and uses __________ as biological vectors.
    • A. 

      Erythrocytes/ black flies

    • B. 

      Erythrocytes/ horse flies

    • C. 

      Lymphocytes/ ixodid ticks

    • D. 

      Erythrocytes/ hard ticks

    • E. 

      Lymphocytes/ horse flies

  • 22. 
    Human babesiosis, caused by Babesia microtti, is transmitted by a tick belonging to the genus _______ which also transmits a spirochete called ______________.
    • A. 

      Ixodes/ Borrelia recurrentis

    • B. 

      Ixodes/ Borrelia burgdorferi

    • C. 

      Rhipicephalus/ Borrella recurrentis

    • D. 

      Rhipicephalus/ Borelia burgdorferi

    • E. 

      Dermacentor/ Borrelia recurrentis

  • 23. 
    The parasites in the Subphylum Sarcomastigophora that infect the large intestines of dogs are _________ and ___________.
    • A. 

      Amebas/ trichomonads

    • B. 

      Amebas/ ciliates

    • C. 

      Ciliates/ trichomonads

    • D. 

      Ciliates/ trichomonads

    • E. 

      Ciliates/ Giardia

  • 24. 
    Flagellated protozoa of the genus Tritrichomonas are characterized by
    • A. 

      An undulating membrane and three anterior flagella

    • B. 

      An undulating membrane and a single anterior flagellum

    • C. 

      No undulating membrane and three anterior flagella

    • D. 

      No undulating membrane and a single anterior flagellum

    • E. 

      None of the above

  • 25. 
    The hemoflagellate _________ is transmitted in the feces (stercorarian) of its intermediate host, the ____________.
    • A. 

      Trypanosoma brucei gambiense/ tsetse fly

    • B. 

      Trypanosoma brucei brucei/ horse fly

    • C. 

      Trypanosoma cruiz/ kissing bug

    • D. 

      Leishmania/ sandfly

    • E. 

      Trypanosoma lewisi/ flea

  • 26. 
    Toxoplasma gondii can be transmitted by which of the following methods?
    • A. 

      Ingestion of a sporulated oocyst

    • B. 

      Transplacental transfer of tachyzoites during an acute infection

    • C. 

      Ingestion of bradyzoites ("cysts") in animal tissue

    • D. 

      All of the above are correct

    • E. 

      Only a and b are correct

  • 27. 
    The life cycle of Hepatozoon americanum differs from other tick-borne diseases in that
    • A. 

      The parasite is found only in Oklahoma

    • B. 

      Infection is initiated when infected ticks containing oocysts are ingested by the dog host

    • C. 

      Transmission is strictly mechanical

    • D. 

      All of the above

    • E. 

      None of the above