Protozoan - Written

Question 1

Trophozoite Characteristics of Entamoeba histolytica

A) Non-motile and lacks pseudopodia.
B) Highly motile and possesses pseudopodia.
C) Non-motile and possesses flagella.
D) Highly motile and lacks pseudopodia.

Answer 1

B) Highly motile and possesses pseudopodia.

Question 2

Which of the following is a feature of the trophozoite stage of Entamoeba histolytica?

A) Lacks a distinctive nucleus.
B) Ingests red blood cells and has a distinctive nucleus.
C) Contains multiple nuclei.
D) Does not ingest red blood cells.

Answer 2

B) Ingests red blood cells and has a distinctive nucleus.

Question 3

The cyst stage of Entamoeba histolytica is characterized by:

A) A single nucleus and lack of chromatoid bodies.
B) “Ring and Dot” nucleus and chromatoid bodies.
C) Biflagellate structure.
D) Absence of a nucleus.

Answer 3

B) “Ring and Dot” nucleus and chromatoid bodies.

Question 4

How many nuclei are present in the quadrinucleate cyst of Entamoeba histolytica?

A) One
B) Two
C) Four
D) Eight

Answer 4

C) Four

Question 5

Entamoeba histolytica is known as:

A) Intestinal flagellate
B) Intestinal amoeba
C) Commensal amoeba
D) Ciliate

Answer 5

B) Intestinal amoeba

Question 6

Entamoeba coli is classified as a:

A) Pathogenic amoeba
B) Intestinal protozoan
C) Commensal amoeba
D) Intestinal ciliate

Answer 6

C) Commensal amoeba

Question 7

Endolimax nana/Iodamoeba butschlii is best described as a:

A) Intestinal amoeba
B) Pathogenic flagellate
C) Commensal amoeba
D) Ciliate

Answer 7

C) Commensal amoeba

Question 8

Blastocystis hominis is categorized under:

A) Intestinal amoebas
B) Commensal flagellates
C) Intestinal Protozoans
D) Pathogenic ciliates

Answer 8

C) Intestinal Protozoans

Question 9

Balantidium coli/Gardia lamblia/ Trichomonas vaginali belongs to which group?

A) Amoebas
B) Commensals
C) Intestinal Protozoans
D) Ciliates and Flagellates

Answer 9

D) Ciliates and Flagellates

Question 10

What is the size range of the Entamoeba coli trophozoite?

A) 1-5 um
B) 5-10 um
C) 10-50 um
D) 50-100 um

Answer 10

C) 10-50 um

Question 11

The movement of Entamoeba coli trophozoites is best described as:

A) Rapid and directional
B) Slow and directional
C) Rapid and undirected
D) Sluggish and undirected

Answer 11

D) Sluggish and undirected

Question 12

Which of the following best describes the pseudopodia of Entamoeba coli trophozoites?

A) Narrow and sharp
B) Broad and blunt
C) Absent
D) Long and filamentous

Answer 12

B) Broad and blunt

Question 13

The nuclear appearance of Entamoeba coli trophozoites is characterized by:

A) Regular peripheral chromatin with a small central karyosome
B) Irregular peripheral chromatin with a large central karyosome
C) Irregular peripheral chromatin with a large eccentric karyosome
D) Regular peripheral chromatin with a large eccentric karyosome

Answer 13

C) Irregular peripheral chromatin with a large eccentric karyosome

Question 14

What is the typical size range for an Entamoeba coli cyst?

A) 5-10 um
B) 10-15 um
C) 15-25 um
D) 25-35 um

Answer 14

C) 15-25 um

Question 15

A mature cyst of Entamoeba coli typically contains how many nuclei?

A) 2
B) 4
C) 6
D) 8

Answer 15

D) 8

Question 16

The chromatoid bodies of Entamoeba coli cysts are:

A) Non-existent
B) Rounded and prominent
C) Pointed and less prominent
D) Pointed and very prominent

Answer 16

C) Pointed and less prominent

Question 17

How many nuclei does the trophozoite stage of Endolimax nana have?

A) 1
B) 2
C) 4
D) 8

Answer 17

A) 1

Question 18

How many nuclei are present in a mature Endolimax nana cyst?

A) 1
B) 2
C) 4
D) 8

Answer 18

C) 4

Question 19

What is the shape characteristic of the Iodamoeba butschlii trophozoite?

A) Spherical
B) Rod-shaped
C) Pear-shaped or teardrop
D) Crescent-shaped

Answer 19

C) Pear-shaped or teardrop

Question 20

How many nuclei are present in young Iodamoeba butschlii cysts?

A) 1
B) 2
C) 4
D) 8

Answer 20

B) 2

Question 21

What is the characteristic feature of Iodamoeba butschlii not visible in the trophozoite stage but seen in cysts?

A) A single nucleus
B) An axostyle
C) Ovoidal nuclei
D) Four nuclei

Answer 21

D) Four nuclei

Question 22

The trophozoite of Iodamoeba butschlii is characterized by having:

A) A single nucleus in the center.
B) A pair of ovoidal nuclei, one on each side of the midline.
C) Multiple nuclei scattered throughout the cytoplasm.
D) No visible nuclei.

Answer 22

B) A pair of ovoidal nuclei, one on each side of the midline.

Question 23

Which structure is characteristic of the bilateral symmetry in Iodamoeba butschlii trophozoites?

A) Flagella
B) Cilia
C) Axostyle
D) Pseudopodia

Answer 23

C) Axostyle

Question 24

Mature cysts of Iodamoeba butschlii typically contain how many nuclei?

A) One
B) Two
C) Four
D) Eight

Answer 24

C) Four

Question 25

The cyst wall of Blastocystis hominis is characterized by being: A) Thin and transparent B) Very prominent and thick C) Permeable and flexible D) Absent or very thin

Answer 25

B) Very prominent and thick

Question 26

What is a distinctive feature of the Blastocystis hominis cyst wall? A) It is osmophilic B) It contains spores C) It has a double membrane D) It is composed of cellulose

Answer 26

A) It is osmophilic

Question 27

A notable feature within the Blastocystis hominis cyst is the: A) Large central vacuole B) Multiple small vacuoles C) Absence of vacuoles D) Single peripheral vacuole

Answer 27

A) Large central vacuole

Question 28

In Blastocystis hominis cysts, the nucleus is located: A) In the center of the cell B) In the cytoplasm around the vacuole C) Within the vacuole D) On the outer edge of the cell

Answer 28

B) In the cytoplasm around the vacuole

Question 29

The shape of Balantidium coli trophozoites is: A) Spherical B) Rod-shaped C) Oval and pointed at the anterior end D) Irregular

Answer 29

C) Oval and pointed at the anterior end

Question 30

Balantidium coli trophozoites are characterized by: A) Lack of cilia B) Being covered in cilia C) Having flagella D) A smooth surface without any protrusions

Answer 30

B) Being covered in cilia

Question 31

What are the shapes of the macronucleus and micronucleus visible in Balantidium coli trophozoites? A) Both spherical B) Both kidney-shaped C) Macronucleus kidney-shaped and micronucleus spherical D) Macronucleus spherical and micronucleus kidney-shaped

Answer 31

D) Macronucleus spherical and micronucleus kidney-shaped

Question 32

What is a distinguishing feature of Balantidium coli cysts? A) Spherical and ovoid in shape B) Long and filamentous C) Square and rigid D) Triangular with pointed ends

Answer 32

A) Spherical and ovoid in shape

Question 33

The cyst wall of Balantidium coli is described as: A) Thin and permeable B) Thick and hard C) Gelatinous and flexible D) Multilayered and soft

Answer 33

B) Thick and hard

Question 34

The shape of Giardia lamblia trophozoites is best described as: A) Spherical B) Rod-shaped C) Pear-shaped or teardrop-shaped D) Crescent-shaped

Answer 34

C) Pear-shaped or teardrop-shaped

Question 35

Giardia lamblia trophozoites are characterized by having: A) A single nucleus in the center B) A pair of ovoidal nuclei one on each side of the midline C) Multiple nuclei scattered throughout the cytoplasm D) No visible nuclei

Answer 35

B) A pair of ovoidal nuclei one on each side of the midline

Question 36

What distinctive line is present in Giardia lamblia trophozoites? A) Axostyle B) Cytostome C) Sutures D) Flagella

Answer 36

A) Axostyle

Question 37

How many nuclei are present in young cysts of Giardia lamblia? A) One B) Two C) Three D) Four

Answer 37

B) Two

Question 38

Mature cysts of Giardia lamblia typically contain how many nuclei? A) One B) Two C) Four D) Eight

Answer 38

C) Four

Question 39

The shape of Trichomonas vaginalis trophozoites is described as: A) Spherical B) Rod-shaped C) Pear-shaped D) Crescent-shaped

Answer 39

C) Pear-shaped

Question 40

What type of motility is observed in Trichomonas vaginalis trophozoites? A) Gliding B) "Twitching type" C) Undulating D) Spinning

Answer 40

B) "Twitching type"

Question 41

How many flagellates does Trichomonas vaginalis have? A) 3 B) 4 C) 5 D) 6

Answer 41

C) 5