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Microbiology MCQ on Protozoa

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1. all protozoan pathogens have a _ phase

  • cyst
  • sexual
  • trophozoite
  • blood

2. Entamoeba histolytica primarily invades the

  • liver
  • large intestine
  • small intestine
  • lungs

3. Giardia is a / an _ that invades the __

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  • flagellate, large intestine
  • amoeba, small intestine
  • ciliate, large intestine
  • flagellate, small intestine

4. Hemoflagellates are transmitted by:

  • mosquito bites
  • insect vectors
  • bug feces
  • contaminated food

5. Plasmodium reproduces sexually in the _ and asexually in the __

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  • -liver, red blood cells
  • mosquito , human
  • human, mosquito
  • red blod cell, liver

6. In the exoerythrocytic phase of infection, Plasmodium invades the :

  • blood cells
  • heart muscle
  • salivary glands
  • liver

7. an oocyst is found in , and a pseudocyst is found in __

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  • humans, cats
  • cats, humans
  • feces, tissue
  • tissue, feces

8. a person can acquire toxoplasmosis from

  • pseudocysts in raw meat
  • oocysts in air
  • cleaning out the cat litter box

9. all adult helminths produce :

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  • -cysts and trophozoites
  • scolex and proglottids
  • fertilized eggs and larvae
  • hooks and cuticles

10. the _ host is where the larva develops, and the _ host is where the adults produce fertile eggs.

  • intermediate , definitive
  • definitive, intermediate
    -secondary, transport
  • primary, secondary

11. antihelminthic medications work by :

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  • paralyzing the worm
  • disrupting the worm’s metabolism
  • causing vomiting

12. host defenses that are most active in worm infestations:

  • phagocytes
  • antibodies
  • killer T cells
  • eosinophils

13. Currently , the most common nematode infestation worldwide is :

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  • hookworm
  • ascariasis
  • tapeworm
  • trichinosis

14. Hookworm diseases are spread by :

  • the feces of humans
  • mosquito bites
  • contaminated food
  • microscopic invertebrates in drinking water

15. Trichinosis can only be spread from human to human by :

  • cannibalism
  • flies
  • raw port
  • contaminated water

16. the swelling of limbs typical of elephantiasis is due to :

  • allergic reaction to the filarial worm
  • granuloma development due to inflammation by parasites
    -lymphatic circulation being blocked by filarial worm
  • heart and liver failure due to infection

17. Which of the following is not considered an insect vector?

  • flea
  • mosquito
  • tick
  • tsetse fly

18. The _ mosquito feeds on blood, which is required for development of __

  • male, larvae
  • male, parasites
  • female, GI tract
  • female, eggs

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