Parasites and Protozoa Quiz

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Questions and Answers

What are the two distinct forms in which parasites occur?

Yeasts and molds

Fungi and algae

Viruses and bacteria

Single-celled protozoa and multicellular metazoa (correct)

Which group of protozoa is characterized by the presence of cilia?

Ciliata (correct)

Sporozoa

Sarcodina

Mastigophora

What is the definitive host for a parasite?

The host that carries the parasite asymptomatically

The host that transmits the parasite to others

The host in which the parasite undergoes essential development

The host in which sexual maturity and reproduction occurs (correct)

Which of the following diseases is caused by Entamoeba histolytica?

Amebic dysentery Signup and view all the answers

What symptom is NOT typically associated with acute intestinal amebiasis?

Fatigue Signup and view all the answers

What feature differentiates the trophozoite stage of Entamoeba histolytica from its cyst stage?

The trophozoite is motile Signup and view all the answers

Which type of metazoa is characterized as flatworms?

Platyhelminthes Signup and view all the answers

Which of the following hosts is a reservoir host?

A host that serves as a source of infection for others Signup and view all the answers

What is Toxoplasmosis primarily caused by?

Toxoplasma gondii Signup and view all the answers

Which insect is the vector for Chagas' disease?

Reduviid bug Signup and view all the answers

What are the two main types of leishmaniasis?

Cutaneous leishmaniasis and Visceral leishmaniasis Signup and view all the answers

Which of the following parasites is a blood fluke?

Schistosoma species Signup and view all the answers

What is the primary method of infection for tapeworms in humans?

Ingesting undercooked flesh containing larvae Signup and view all the answers

Which Leishmania infection is most prevalent in Turkey?

Cutaneous leishmaniasis Signup and view all the answers

Which parasite is responsible for sleeping sickness?

Trypanosoma brucei gambiense Signup and view all the answers

What distinguishes the head of a tapeworm?

Scolex Signup and view all the answers

Which of the following are true regarding the body structure of nematodes?

Nematodes have a complete digestive tract with a mouth and an anus. Signup and view all the answers

Which of the following nematodes is transmitted primarily through ingestion of eggs?

Ascaris Signup and view all the answers

What type of transmission is associated with the guinea worm, Dracunculus?

Ingestion of crustaceans in drinking water Signup and view all the answers

Which category do Wuchereria, Onchocerca, and Loa belong to?

Filarial worms Signup and view all the answers

Which of the following nematodes is NOT classified as an intestinal nematode?

Strongyloides Signup and view all the answers

What feature distinguishes male nematodes from female nematodes?

Males possess a coiled tail. Signup and view all the answers

Which of the following nematodes is primarily transmitted through larvae rather than eggs?

Necator Signup and view all the answers

Which statement about the medically important cestodes is correct?

Cestodes have a segmented body structure. Signup and view all the answers

What symptom is commonly associated with giardiasis?

Watery, foul-smelling diarrhea Signup and view all the answers

Which of the following is true about Trichomonas vaginalis?

It has an undulating membrane extending about two-thirds of its length. Signup and view all the answers

What are the stages of the life cycle of Giardia lamblia?

Trophozoite and cyst Signup and view all the answers

Which malaria-causing plasmodia is noted for being more common and lethal?

Plasmodium falciparum Signup and view all the answers

Which phase of the plasmodium life cycle occurs in humans?

Schizogony Signup and view all the answers

What is a significant factor in the epidemiology of malaria?

It affects more than 200 million people globally. Signup and view all the answers

What type of discharge is commonly associated with trichomoniasis in women?

Watery and foul-smelling Signup and view all the answers

What is the vector that transmits malaria?

Female Anopheles mosquito Signup and view all the answers

Study Notes

Medically Important Parasites

Parasites come in two forms: single-celled protozoa and multicellular helminths (worms).
Protozoa are subdivided into Sarcodina (amebas), Sporozoa (sporozoans), Mastigophora (flagellates), and Ciliata (ciliates).
Metazoa are divided into Platyhelminthes (flatworms) and Nemathelminthes (roundworms). Flatworms include Cestoda (tapeworms) and Trematoda (flukes). Roundworms include nematodes.
Giardia lamblia is a protozoan that causes intestinal and urogenital infections. Symptoms include watery, foul-smelling diarrhea with nausea, anorexia, flatulence, abdominal cramps, and no fever.
Entamoeba histolytica is a protozoan that causes amebic dysentery and liver abscess. The life cycle includes motile ameba and non-motile cyst stages.
Trichomonas vaginalis is a flagellated protozoan that causes trichomoniasis. It is a pear-shaped organism with a central nucleus and four anterior flagella.
Plasmodium is a blood and tissue protozoan that causes malaria. It has a sexual stage in mosquitoes and an asexual stage in humans. The female anopheles mosquito is the vector. Worldwide, it is a leading cause of death.
Toxoplasma gondii causes toxoplasmosis, a zoonotic disease. It infects many animals. It can be transmitted transplacentally, and cause spontaneous abortion, stillbirth, or severely mentally/physically impaired child.
Trypanosoma cruzi is the cause of Chagas' disease. The life cycle of Chagas' disease involves the reduviid bug (Triatoma, cone-nose or kissing bug)as the vector.
Trypanosoma gambiense and Trypanosoma rhodesiense cause sleeping sickness. The vector is the tsetse fly.
Leishmania is a protozoan that causes leishmaniasis. It is transmitted by female sandflies. There are cutaneous, visceral, and mucosal forms.
Helminths are a large group of parasites, including flukes and tapeworms. The most important trematodes are Schistosoma species, and Paragonimus westermani.
Nematodes are another substantial group, comprising roundworms. The medically significant ones include intestinal and tissue nematodes,.

Important Definitions

Definitive host - The host in which sexual maturity and reproduction of the parasite occurs.
Intermediate host - The host in which the parasite develops.
Reservoir host - A host that harbors the parasite, serving as a source of infection for other susceptible hosts but shows no symptoms of the disease.
Vector - An organism that transmits a parasite from one host to another. Often an insect.
Cyst - A resting state of a protozoan or helminth parasite.
Trophozoite - The active, feeding stage of a protozoan parasite.

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Description

Test your knowledge on parasites and protozoa with this quiz. It covers various aspects such as host types, diseases caused by specific parasites, and distinguishing features of parasitic life stages. Perfect for students studying biology or medical sciences.