Parasitology Laboratory
MULTIPLE CHOICE QUESTIONS:
Select the BEST answer. (20 points)
1. The standard method for diagnosing active lymphatic
filariasis is by microscopic examination of ______.
A. wet blood smear
B. thin blood smear
C. thick blood smear
D. tissue specimen
2. Blood from patients suspected to be infected with
Wuchereria bancrofti should be drawn______.
A. around noon
B. between the hours of 10 PM and 2 AM
C. between the hours of 10 AM and 2 PM
D. anytime
3. Giemsa staining will stain the sheath of______.
A. Wuchereria bancrofti
B. Brugia malayi
C. Loa loa
D. Onchocerca volvulus
4. There is NO caudal space seen in microfilariae of
______.
A. Mansonella perstans
B. Mansonella ozzardi
C. Onchocerca volvulus
D. Wuchereria bancrofti
5. Which of the following does NOT correctly describe
the tail of Mansonella streptocerca microfilariae?
A. end tends to be tapering to a point
B. partially coiled called “shepherd’s crook”
C. nuclei continuous to the tip
D. all of the above
6. Skin snip microscopy is used in the diagnosis of
______.
A. Mansonella ozzardi
B. Loa loa
C. Onchocerca volvulus
D. Brugia malayi
7. The following characteristics correctly describe the
tapeworms, EXCEPT:
A. incomplete digestive system
B. hermaphroditic
C. acoelomate
D. segmented body
8. Which of the following correctly describes the
tapeworm scolex?
A. bears the organs of attachment
B. used for parasite feeding
C. the region of segment proliferation
D. where eggs accumulate
9. Taenia saginata adults reach a length of ______.
A. millimeter
B. 10 centimeters
C. 1 meter
D. 10 meters
10. Eggs of pseudophyllidean tapeworms are released
through the ______.
A. genital pore
B. uterine pore
C. disintegration of the gravid proglottids
D. rupture of mature proglottids
11. Which of the following is known as the true bladder
worm?
A. cysticercus
B. coenurus
C. cysticercoid
D. hydatid cyst
12. The morphology of a Taenia solium tapeworm scolex
reveals ______.
A. 4 suckers
B. rostellum
C. hooks
D. all of these
13. Which of the following tapeworms have proglottids
that are broader than they are long?
A. Dipylidium caninum
B. Taenia solium
C. Diphyllobothrium latum
D. Echinococcus granulosus
14. The following worms produce eggs that are NOT
operculated, and contain mature larva, EXCEPT:
A. Schistosoma species
B. Diphyllobothrium latum
C. Taenia species
D. Hymenolepis nana
15. The term “digenetic” used among the trematodes
refers to the two ______.
A. hosts required in their life cycle
B. phases of reproduction: sexual and asexual
C. developmental forms in the life cycle
D. sexually differentiated adult worms: male and
female
16. The heterophyids can readily be differentiated from
the other flukes by the presence of ______.
A. genital pore
B. gonotyl
C. gynecophoral canal
D. acetabulum
17. Trematode, that is easily identified by the collar of
spines along the lateral sides of the head of the adult
stage, is ______.
A. Fasciola hepatica
B. Echinostoma ilocanum
C. Paragonimus westermani
D. Schstosoma japonicum
18. Female schistosomes, compared to the males,
______.
A. are more robust
B. are longer
C. has a gynecophoral canal
D. all of these
Parasitology Laboratory
19. The observation of embryonic flame cell activity is
recommended to demonstrate the viability of the eggs
of ______.
A. Taenia species
B. Schistosoma species
C. Fasciola / Fasciolopsis
D. Clonorchis / Opisthorchis
20. Spot urine samples to be examined for Schistosoma
haematobium should be collected ______.
A. at daylight
B. between noon and 3 PM
C. between 10 PM and 2 AM
D. anytime
CORRELATION TEST: 2PTS EACH
Refer to the images (note: images NOT shown to scale).
Answer the questions or complete the statements using the
following
key
outline.
(30
points)
23. This is the diagnostic form of parasite that can be
isolated in: 1. blood; 2. Urine
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
24. This is a tapeworm scolex. Select the morphologic
characteristic of the gravid proglottid of this species.
1. have genital pores on the same side of the strobila;
2. have central, rosette-shaped uterus
21. This is a microfilaria of a parasite that: 1. affects
people in the Philippines; 2. may occur as nocturnally
subperiodic in the Pacific Region
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
22. This test system, which can be attached to a syringe,
depending on the clinical specimen, is useful for the
recovery of: 1. microfilariae; 2. Schistosoma
haematobium
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
25. Finding these eggs in the feces of man is diagnostic.
The laboratory report shall indicate: 1. Echinococcus
eggs; 2. Taenia eggs
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
Parasitology Laboratory
26. This is an image of a structure obtained from stool
specimen after india ink injection procedure. Which of
the following statements is correct? 1. Parasitic
infection is caused by Taenia saginata.; 2. Finding
this structure is a necessary tool in checking the
results of antihelminthic treatment of tapeworms.
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
27. Finding this parasitic stage in man is associated with:
1. Taenia saginata; 2. Taenia solium
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
29. Which of the following correctly describes the
parasite shown? 1. Adult worm inhabits the intestines
of man.; 2. Diagnosis of human infections is based on
identification of eggs in stool.
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
30. This egg, measuring about 140 by 70 μm, was seen in
the saline wet preparation examination of stool from
a patient who presented to the physician with
jaundice and right upper quadrant pain. The adult
worm can be readily differentiated from another worm
that is morphologically similar by their: 1. branched
testes in tandem; 2. conical shoulder on the anterior
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
28. Recovery and identification of this characteristic egg
is the basis for the diagnosis of a parasite that: 1. has
a scolex with retractable rostellum with one single
circle of between 20 and 30 hooks and a tetrad of
suckers; 2. is considered as the smallest tapeworm
infecting man
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
31. This trematode stage develops to sexual maturity in
the: 1. biliary passages; 2. small intestines
Parasitology Laboratory
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
32. This is a parasite egg found in stool. Which
examination technique may apply? 1. Zinc sulfate
flotation method is recommended for its recovery.; 2.
Examine and identify using the 10x (low-power)
objective.
34. In which specimen may this characteristic egg be
found? 1. sputum; 2. Urine
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
35. Which of the following correctly describe/s adults of
this parasite? 1. The ovary in female is on the anterior
half of the body.; 2. Males have finely tuberculated
tegument.
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
33. Which of the following correctly describes the eggs
laid by this parasite? 1. can be detected in the sputum
and the stool; 2. has a “seated” operculum and knob
at the abopercular end
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
MAGNITUDE TEST” 2 POINTS EACH
Compare A and B based on the criterion given. Answer using
the key outline below. (20 points)
36. Width of the microfilaria: A. Wuchereria bancrofti; B.
Mansonella perstans
A = if only option 1 is correct
B = if only option 2 is correct
C = if BOTH are correct
D = if NONE is correct
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
37. Number of acetabula in the scolex: A. pork tapeworm;
B. dog tapeworm
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
38. Number of proglottids comprising the strobila: A.
Diphyllobothrium latum; B. Echinococcus granulosus
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
Parasitology Laboratory
39. Number of ovarian lobe/s in a segment: A. Taenia
saginata; B. Taenia solium
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
40. Number of complete set/s of male and female
reproductive systems: A. Echinococcus granulosus;
B. Dipylidium caninum
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
41. Number of scolices in the cyst: A. cysticercoid; B.
cysticercus
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
42. Number of lateral uterine branches in each gravid
proglottid: A. Taenia saginata; B. Taenia solium
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
43. Number of testes in the adult: A. Fasciolopsis buski;
B. Echinostoma ilocanum
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
44. Number of testes the in adult worm: A. Schistosoma
japonicum; B. Schistosoma mansoni
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
45. Number of eggs in the uterus: A. vesical blood fluke;
B. oriental blood fluke
A = if A is greater than B
B = if B is greater than A
C = if A and B are equal
IDENTIFICATION: 2POINTS EACH
Identify the TEST METHOD described in the following and
cite a PARASITE associated with it. (10 points)
46. An oral test dose of 50 mg diethylcarbamazine
results in intense pruritus within 2 hours.
Mazzotti reaction- Onchocerca volvulus
47. An immediate hypersensitivity skin test involving
intradermal injection of sterilized fluid from hydatid
cysts
Casoni’s intradermal test- Echinococcus granulosus
48. Concentration procedure using blood and dilute
formalin
Knott’s concentration method- Wuchereria bancrofti
49. Formation of blebs of precipitates around the eggs in
the presence of immune serum
Circumoval Precipitin Test- Schistosoma species
50. Blood is lyzed and passed through a 5-μm
polycarbonate filter and subsequently stained
Membrane Filtration Technique- Mansonella
streptocerca