Protozoa

Description

MCQ for 3rd year medical students
Nada Medhat
Quiz by Nada Medhat, updated more than 1 year ago
Nada Medhat
Created by Nada Medhat about 6 years ago
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Resource summary

Question 1

Question
Each of the following statements concerning malaria is correct EXCEPT:
Answer
  • Release of merozoites from red blood cells causes periodic fever and chills.
  • The principal site of gametocyte formation is the human gastrointestinal tract.
  • Early in infection, sporozoites enter hepatocytes.
  • The female Anopheles mosquito is the vector.

Question 2

Question
Which of the following agent is used to prevent Malaria
Answer
  • Mebendazole
  • Chloroquine
  • Zinc tablet
  • Inactivated vaccine

Question 3

Question
Laboratory diagnosis of a patient with a suspected liver abscess due to Entamoeba histolytica should include:
Answer
  • Stool examination and indirect hemagglutination test
  • Stool examination and blood smear
  • Xenodiagnosis and string test
  • Indirect hemagglutination test and skin test

Question 4

Question
Infective stage of Entamoeba histolytica is:
Answer
  • filariform larvae
  • trophozoite
  • quadrinucleate cyst
  • sporozoite

Question 5

Question
A 30-year-old woman presents to her gynecologist with complaints of vaginal itching and a frothy, yellow discharge. She also complains of painful urination. She admits to being sexually active with several men in the past two weeks. Cultures are negative for bacterial growth, but organisms are visible via a wet preparation on low power. The most likely causal agent is
Answer
  • Chlamydia trachomatis
  • Giardia lamblia
  • Candida albicans
  • Trichomonas vaginalis

Question 6

Question
Each of the following parasites has an intermediate host as part of its life cycle EXCEPT:
Answer
  • Taenia solium
  • Trichomonas vaginalis
  • Echinococcus granulosus
  • Toxoplasma gondii

Question 7

Question
In malaria, the form of plasmodia that is transmitted from mosquito to human is the:
Answer
  • Merozoite
  • Hypnozoite
  • Sporozoite
  • Gametocyte

Question 8

Question
Trophozoites, Schizonts and gametocytes of all the malarial parasites are seen in the peripheral blood smear except;
Answer
  • P. ovale
  • P. falciparum
  • P. vivax
  • P. malariae

Question 9

Question
A 35-year-old man comes to the emergency department complaining of high fever, chills, severe headache, and confusion. He has recently returned from Africa. A peripheral blood smear reveals multiple ring structures and crescent-shaped gametes. Which of the following organisms is the most likely cause?
Answer
  • Plasmodium falciparum
  • Plasmodium malariae
  • Plasmodium vivax
  • Leishmania species

Question 10

Question
Each of the following statements concerning sleeping sickness is correct EXCEPT:
Answer
  • Sleeping sickness can be diagnosed by finding eggs in the stool.
  • Sleeping sickness is transmitted by tsetse flies.

Question 11

Question
Each of the following statements concerning kala-azar is correct except:
Answer
  • Kala-azar is caused by Leishmania donovani
  • kala-azar is transmitted by the bite of sandflies
  • Kala-azar occurs primarily in rural latin America
  • Kala-azar can be diagnosed by finding amastigotes in bone marrow

Question 12

Question
The pathogenic protozoon with extra-intestinal spread through blood is:
Answer
  • Giardia Lamblia
  • Entamoeba coli
  • Isasporabelli
  • Entamoeba histolytica

Question 13

Question
Naegleria fowleri infection is diagnosed by:
Answer
  • Blood film
  • Serological examination
  • Lumber puncture
  • None of the above

Question 14

Question
Naegleria fowleri is
Answer
  • Permanent parasite of man
  • Free living amoeba
  • Non pathogenic
  • Found in running water stream

Question 15

Question
Acanthamoeba species cause:
Answer
  • chronic primary meningoencephalitis
  • keratitis with blindness
  • granuloma of internal organs
  • all of the above

Question 16

Question
regarding toxoplasmosis in humans:
Answer
  • becomes active in immuno-compromised patients
  • acute infection could be transmitted from mother to fetus
  • associated with cats
  • is mainly diagnosed by serological tests
  • all of the above

Question 17

Question
oocyst of Toxoplasma is found in:
Answer
  • human tissue
  • the brain of chronic patients
  • faeces of infected cat
  • all of the above

Question 18

Question
cryptosporidium multiplies in:
Answer
  • the lumen of small intestine
  • the brush border of epithelial lining of small intestine
  • the lumen of large intestine
  • non of the above

Question 19

Question
in visceral Leishmaniasis culture of the biopsy material on NNN medium results in :
Answer
  • amastigote form
  • Leptomonas form (promastigote)
  • Epimastigote form
  • Leishmania form

Question 20

Question
Each of the following statements concerning Trypanosoma cruzi is correct EXCEPT:
Answer
  • T. cruzi typically affects heart muscle, leading to cardiac failure.
  • T. cruzi occurs primarily in tropical Africa.
  • T. cruzi is transmitted by the reduviid bug.
  • T. cruzi can be diagnosed by seeing amastigotes in a bone marrow aspirate.
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