Exercises Lesson

INSTRUCTIONS: Answer the following exercises by marking the lettered response that best answers the exercise, by completing the incomplete statement, or by writing the answer in the space provided at the end of the exercise.

After you have completed all the exercises, turn to "Solutions to Exercises" at the end of the lesson and check your answers. For each exercise answered incorrectly, reread the material referenced with the solution.

1. The definitive host for Taeniarhynchus saginatus is/are:

b. Piscivores.

c. Rodents.

d. Carnivores.

2. The common name for members of the Class Cestoda is:

a. Blood fluke.

c. Roundworm.

d. Tapeworm.

3. What is the habitat of Schistosoma haemotobium?

a. Venules surrounding the small intestines.

b. Small intestine.

d. Venules surrounding urinary bladder.

4. If you recover a scolex which is armed and has four round suckers, you would report:

a. Taeniarhynchus saginatus.

b. Taenia solium.

c. Diphyllobothrium latum.

d. None of the above.

5. The subclass of flukes which contains members parasitic to humans is:

a. Monogenea.

b. Digenea.

c. Aspidobothria.

d. Prosostomatea.

6. The structure in which the internal organs of Platyhelminthes are embedded is the:

a. Flame cell.

b. Ganglion.

c. Parenchyma.

d. Proglottid.

7. Members of the Class Cestoda have a highly developed_system.

a. Digestive.

b. Respiratory.

c. Reproductive.

d. Muscular.

8. The specimen of choice for recovery of Paragonimus westermani is:

a. Lung biopsy.

c. Tissue.

d. Sputum.

9. The adult form of Fasciola hepatica is distinguished by:

a. Large size.

b. A prominent cephalic cone.

c. Highly branched digestive ceca.

d. All of the above.

10. The form of Echinococcus multilocularis which is responsible for infecting man is the:

a. Hydatid larva.

c. Protoscolex.

11. Which of the following structures is helpful when identifying ova of Opisthorchis sinensis?

a. Thickening of the abopercular end.

b. Abopercular comma.

c. Operculated at the broadest end.

d. All of the above.

12. Which of the following terms is one of the general characteristics of flukes?

a. Polyzoic.

b. Segmented.

c. Monozoic.

d. None of the above.

13. Clinical data reveals that_produces the most embolic eggs and more severe lesions in man.

a. Schistosoma japonicum.

b. Avian Schistosoma.

c. Schistosoma mansoni.

d. Schistosoma haemotobium.

14. Infections of Schistosoma mansoni are acquired by:

a. Ingestion of the mature egg.

b. Consumption of infected fish.

c. Active penetration of the cercaria larva.

d. Drinking water containing metacercaria larva.

15. Second intermediate hosts of the Opisthorchis species are:

b. Aquatic plants.

c. Crabs and crayfish.

16. The testes of Dicrocoelium dendriticum are:

a. Highly dendritic.

b. In the posterior half of the body.

c. In the anterior half of the body.

d. Tandem in position.

17. The adults of Fasciolopsis buski can be readily distinguished from Fasciola hepatica by:

a. The undulating ceca.

b. The lack of a cephalic cone.

c. The flushy color of the body.

d. All of the above.

18. What is the habitat of Metagonimus yokogawai?

b. Small intestine.

d. Large intestine.

19. Which of the following flukes has an off-set gonotyl as one of the distinguishing characteristics?

a. Schistosoma species.

b. Heterophyes heterophyes.

c. Dicrocoelium dendriticum.

d. Metagonimus yokogawai.

20. Hogs and the Napu mouse deer are the reservior hosts for:

a. Paragonimus westermani.

b. Opisthorchis sinensis.

c. Gastrodiscoides hominis.

d. Echinostoma species.

21. The terminal (distal) segments of a tapeworm are called:

a. Gravid proglottids.

b. Gonopores.

c. Mature proglottids.

d. Strobila.

22. The infective form of Diphyllobothrium latum ingested with improperly cooked fish is the:

a. Plerocercoid.

b. Cysticercoid.

c. Procercoid.

d. Cysticercus.

23. The scolex of Hymenolepis nana could be described as being:

a. Armed with a row of hooklets on a retractile rostellum.

b. Unarmed with an apical process.

c. Armed with 3-7 rows of hooklets.

d. Unarmed with no rostellum.

24. Which of the organisms listed below is the rat tapeworm?

a. Diphyllobothrium latum.

b. Hymenolepis diminuta.

c. Dipylidium caninum.

d. Hymenolepis nana.

25. Egg packets containing 15 to 20 eggs are significant for:

a. Echinococcus granulosus.

b. Dipylidium caninum.

c. Spirometra species.

d. Diphyllobothrium latum.

26. The specimen source for the recovery of Echinococcus species is:

a. Canine feces.

b. Bone marrow.

c. Tissue biopsies. d All of the above.

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