Protozoans Flashcards
What are the two morphological forms of the amoeba group?
a. Oocyst and cyst
b. Cyst and ova
c. Trophozoite and hydatid cyst
d. Cyst and trophozoites
d. Cyst and trophozoites
Which of the following describes the process wherein
a cyst form is converted into trophozoite form?
a. Exflagellation
b. Encystation
c. Excystation
d. Exonerations
c. Excystation
A fresh liver aspirate collected from an admitted
patient strongly suggests an amoebic liver abscess.
Which of the following best describes the sample?
a. Greenish, fish-like odor
b. Chocolate brown, odorless
c. Grayish, purulent, odorless
d. Thick, reddish, foul odor
b. Chocolate brown, odorless
Which of the following can be
recovered from an amoebic liver abscess aspirate?
a. Motile trophozoites only
b. Both trophozoites and cyst forms
c. Cyst forms only
d. None
a. Motile trophozoites only
Which of the following parasites enters the sub-mucosa of the intestines through proteolytic enzymes and gives rise to a broad base or flask-shaped ulcers?
a. Giardia lamblia
b. E. histolytica
c. Strongyloides stercoralis
d. E. coli
b. E. histolytica
Which of the following control measles is NOT
effective in Entamoeba histolytica prevention?
a. Proper sewage disposal
b. Normal chlorination of water
c. Iodination of water
d. Fly-control
b. Normal chlorination of water
In environments which are potentially lethal to the cell,
an amoeba may become dormant by surrounding
itself with a protective membrane to become which of the following?
a. Spore
b. Cyst
c. Endospores
d. Capsulated trophozoite
b. Cyst
All of the following are flagellates, EXCEPT:
A. Dientamoeba fragilis
B. Retortamonas intestinalis
C. Enteromonas hominis
D. Chilomastix mesnili
a. None of the above
b. 2 only
c. 1, 2, 3
d. 1, 2, 3, 4
a. None of the above
This trophozoite resembles a “badminton racket” with
2 oval nuclei and 4 pairs of flagella. It exhibits a falling
leaf motility. Which of the following method can be
used for its diagnosis?
- DFS
- Duodenal aspiration
- ZnSO4 floatation technique
- Enterotest
a. 1 and 2
b. 1, 2, and 3
c. 2 and 3
d. 1, 2, 3, 4
d. 1, 2, 3, 4
On what amoebic stage does reproduction occur?
a. Cyst
b. Trophozoite
c. Pre cystic stage
d. Metacystic trophozoite
b. Trophozoite
Why do you have to prepare fecal smear using
Lugol’s iodine solution side by side with NSS?
a. The procedure calls for it
b. To duplicate smears
c. To enhance visibility of parasites
d. To recover the parasites as soon as possible
c. To enhance visibility of parasites
How does amoeba reproduce?
a. Mitosis
b. Budding
c. Binary fission
d. No, they do not reproduce
c. Binary fission
What protozoan parasite causes malabsorption and
maldigestion characterized by steatorrheaic stool?
a. Entamoeba histolytica
b. Chilomastix mesnili
c. Giardia lamblia
d. Endolimax nana
c. Giardia lamblia
Accdg to the CDC, this protozoan is considered as a
flagellate that lacks external flagella. Cyst like stage is
rarely seen.
a. Giardia lamblia
b. Entamoeba histolytica
c. Entamoeba coli
d. Dientamoeba fragilis
d. Dientamoeba fragilis
Which of the following correctly describes the parasite shown? (Blue background, 2 nuclei)
a. Ingests RBC and occasional bacteria
b. Ingests WBCs, RBCs & Yeast Cells
c. Sluggish motility & blunt pseudopodia
d. Progressive motility
a. Ingests RBC and occasional bacteria
Which of the following Protozoan parasite has a
prominent spiral groove & shepherd’s crook
cytostome?
a. Trichomonas hominis
b. Chilomastix mesnili
c. Giardia lamblia
d. Entamoeba nana
b. Chilomastix mesnili
How can you best differentiate Entamoeba dispar from E. histolytica cyst?
a. Trichomonas hominis
b. Chilomastix mesnili
c. Giardia lamblia
d. Entamoeba nana
d. Entamoeba nana
Which of the following correctly describes the parasite shown? (small brown circle)
a. Hematophagous and moves rapidly
b. Vacuolar form is the most commonly encountered
c. Has basket like nucleus and thin peripheral chromatin
d. Has blot like karyosome
b. Vacuolar form is the most commonly encountered
Which of the following is true about Trichomonas
hominis?
a. The cyst stage is both the diagnostic and infective stage
b. The diagnostic specimen can either be stool or urine
c. It has 5 anterior flagella with jerky motility
d. Pyriform in shape with undulating membrane
occupying half of its body
c. It has 5 anterior flagella with jerky motility
Which of the following does not correctly describe the
parasite shown? (pink, big with sausage chromatoidal bar )
a. Moves with cilia and has 2 nucleus
b. Pyriform in shape with stiff rotary movement.
c. A visible funnel shaped mouth is observed
d. 1 -2 contractile vacuoles are usually present
b. Pyriform in shape with stiff rotary movement. (Gardia Lamblia)
Which of the following does not characterize Entamoeba coli?
a. Uneven peripheral chromatin
b. Eccentric karyosome with 5 to 8 nucleus
c. Trophozoite moves slowly and is hematophagous
d. With blunt and granular pseudopodia.
c. Trophozoite moves slowly and is hematophagous
Protozoan cysts are found in a wet mount preparation. The cysts are without peripheral chromatin on the nuclear membrane. Each cyst has 4
nuclei, and each nucleus has a large karyosome which appears as a refractive dot. The cytoplasm is described to be non-granulated. The cyst found is most likely to be which of the following protozoans?
a. Entamoeba histolytica
b. Entamoeba coli
c. lodamoeba butschlii
d. Endolimax nana
d. Endolimax nana
A diarrheic stool was received in the Laboratory during the night shift. The Med. Tech. on duty prepared a Lugol’s iodine and NSS smear. Upon examination under HPF, presents a progressively moving organism whose pseudopod is long and
extending. Upon further observation cytoplasm contains no inclusion bodies and appears as ground
glass. A single nucleus with even peripheral chromatin and centrally located karyosome was noted. The trophozoite was indicated with a range of 0-1/hpf. How would the staff release the results?
a. Entamoeba histolytica/ dispar troph: 0-1/hpf
b. Entamoeba histolytica: 0-1/ hpf
c. Entamoeba histolytica/ coli trophozoite: 0-1/hpf
d. No parasites seen on DFS
a. Entamoeba histolytica/ dispar troph: 0-1/hpf
Kyle was rushed to the emergency room with a history of diarrhea and vomiting for three days. Series of stool specimens were collected and examined.
These were later found out to be positive for the Protozoan cysts are found in a wet mount preparation. Presence of round or slightly oval
amoeba with large karyosome, five nuclei, and jagged chromatoidal bodies. Which of the protozoans below was most likely protozoan seen?
a. Entamoeba histolytica trophozoite
b. Entamoeba coli trophozoite
c. Entamoeba histolytica cyst
d. Entamoeba coli cyst
d. Entamoeba coli cyst
