Question 1

Which of the following statements concerning infection with Toxoplasma is FALSE?

Accepted Answer

A)  It is one of the world's most widely distributed protozoan parasites in humans. 
B)  The majority of infected people are asymptomatic. 
C)  It usually results in no permanent damage and is self- limiting. 
D)  It is typically contracted by eating undercooked meat. 
E)  Even though it can be transmitted across the placenta, it is harmless to the fetus. 
A)  It is one of the world's most widely distributed protozoan parasites in humans. 
B)  The majority of infected people are asymptomatic. 
C)  It usually results in no permanent damage and is self- limiting. 
D)  It is typically contracted by eating undercooked meat. 
E)  Even though it can be transmitted across the placenta, it is harmless to the fetus. E

Question 2

The tsetse fly is responsible for the spread of

Accepted Answer

A)  filariasis. 
B)  toxoplasmosis. 
C)  Chagas' disease. 
D)  kala- azar. 
E)  African sleeping sickness. 
A)  filariasis. 
B)  toxoplasmosis. 
C)  Chagas' disease. 
D)  kala- azar. 
E)  African sleeping sickness. E

Question 3

Trypanosoma cruzi is introduced into the body by

Accepted Answer

A)  feces containing trypomastigotes contaminating a bite wound. 
B)  ingesting food contaminated with the parasite. 
C)  the bite of a tsetse fly, which introduces the trypomastigotes into the body. 
D)  the bite of a sand fly that has ingested phagocytes containing the parasite. 
E)  wearing contact lenses cleaned with contaminated tap water. 
A)  feces containing trypomastigotes contaminating a bite wound. 
B)  ingesting food contaminated with the parasite. 
C)  the bite of a tsetse fly, which introduces the trypomastigotes into the body. 
D)  the bite of a sand fly that has ingested phagocytes containing the parasite. 
E)  wearing contact lenses cleaned with contaminated tap water. A

Question 4

Once infected with Trypanosoma brucei, the patient's immune system cannot clear the infection and develop immunity because the parasite

Accepted Answer

A)  has flagella that allow it to travel all over the body. 
B)  changes its glycoprotein surface antigens every time it replicates. 
C)  matures into infectious trypomastigotes. 
D)  invades the central nervous system. 
E)  reproduces by binary fission. 
A)  has flagella that allow it to travel all over the body. 
B)  changes its glycoprotein surface antigens every time it replicates. 
C)  matures into infectious trypomastigotes. 
D)  invades the central nervous system. 
E)  reproduces by binary fission.

Question 5

A hunter was camping with his dog near a mountain spring where beavers were building a dam. After a month, he developed severe watery diarrhea, abdominal pain, bloating, vomiting, and low- grade fever. His stool had a "rotten- egg" smell of hydrogen sulfide. What is the most likely parasite causing this patient's condition, and how is diagnosis confirmed?

Accepted Answer

This person is most likely suffering fro

Question 6

Apicomplexans reproduce asexually by (mitosis/schizogony/fission).

Accepted Answer

The answer of Apicomplexans reproduce asexually by (mitosis/schizogony/fission)....

Question 7

The primary risk to humans infected with Echinococcus granulosus is

Accepted Answer

A)  formation of hydatid cysts. 
B)  intestinal obstruction. 
C)  development of cysticerci. 
D)  anemia. 
E)  infection of the fetus. 
A)  formation of hydatid cysts. 
B)  intestinal obstruction. 
C)  development of cysticerci. 
D)  anemia. 
E)  infection of the fetus.

Question 8

Which of the following is transmitted by the fecal- oral route?

Accepted Answer

A)  Entamoeba histolytica 
B)  Trichomonas 
C)  Plasmodium 
D)  Schistosoma and Trichomonas 
E)  Schistosoma 
A)  Entamoeba histolytica 
B)  Trichomonas 
C)  Plasmodium 
D)  Schistosoma and Trichomonas 
E)  Schistosoma

Question 9

All tapeworms are intestinal parasites that completely lack digestive systems.

Accepted Answer

A) True 
 B)False

Question 10

The mildest type of malaria is caused by Plasmodium (falciparum/malariae/ovale/vivax).

Accepted Answer

The answer of The mildest type of malaria is caused...

Question 11

Triatoma, commonly called "kissing bugs," are vectors of

Accepted Answer

A)  Chagas' disease. 
B)  African sleeping sickness. 
C)  Cyclosporiasis. 
D)  Leishmania. 
E)  schistosomiasis. 
A)  Chagas' disease. 
B)  African sleeping sickness. 
C)  Cyclosporiasis. 
D)  Leishmania. 
E)  schistosomiasis.

Question 12

Which of the following vectors may spend their entire life associated with a single host individual?

Accepted Answer

A)  lice 
B)  mites 
C)  spiders 
D)  ticks 
E)  fleas 
A)  lice 
B)  mites 
C)  spiders 
D)  ticks 
E)  fleas

Question 13

Elephantiasis is caused by

Accepted Answer

A)  filarial roundworms. 
B)  blood flukes. 
C)  flatworms. 
D)  liver flukes. 
E)  tapeworms. 
A)  filarial roundworms. 
B)  blood flukes. 
C)  flatworms. 
D)  liver flukes. 
E)  tapeworms.

Question 14

Compare and contrast infection with Taenia saginata and Echinococcus granulosus in humans, including the consequences of the infections.

Accepted Answer

Both of these parasites are cestodes (ta

Question 15

Which of the following is the most important vector of human diseases?

Accepted Answer

A)  mites 
B)  lice 
C)  fleas 
D)  mosquitoes 
E)  sand flies 
A)  mites 
B)  lice 
C)  fleas 
D)  mosquitoes 
E)  sand flies

Question 16

Which of the following is the most common parasitic disease in industrialized nations?

Accepted Answer

A)  toxoplasmosis 
B)  giardiasis 
C)  Trichomonas infection 
D)  balantidiasis 
E)  schistosomiasis 
A)  toxoplasmosis 
B)  giardiasis 
C)  Trichomonas infection 
D)  balantidiasis 
E)  schistosomiasis

Question 17

How does the life cycle for the Trypanosoma that causes sleeping sickness differ from the one that causes Chagas' disease?

Accepted Answer

Sleeping sickness is caused by T. brucei

Question 18

How are the different types of Schistosoma identified?

Accepted Answer

A)  by the treatments they respond to 
B)  by the location of the swimmer's itch they cause 
C)  by their intermediate host 
D)  by the lesion they cause 
E)  by the position of their spine and the shape of their eggs 
A)  by the treatments they respond to 
B)  by the location of the swimmer's itch they cause 
C)  by their intermediate host 
D)  by the lesion they cause 
E)  by the position of their spine and the shape of their eggs

Question 19

Which of the following is the same for both Trypanosoma cruzi and Trypanosoma brucei?

Accepted Answer

A)  means of entry into the host 
B)  type of arthropod vector 
C)  importance of early diagnosis and treatment 
D)  central nervous system infection 
E)  where the protozoan matures in the vector 
A)  means of entry into the host 
B)  type of arthropod vector 
C)  importance of early diagnosis and treatment 
D)  central nervous system infection 
E)  where the protozoan matures in the vector

Question 20

Which of the following parasites is NOT generally microscopic in its mature form, even though microbiologists usually study them?

Accepted Answer

A)  leishmanias 
B)  amoebae 
C)  cyclosporas 
D)  toxoplasmas 
E)  helminths 
A)  leishmanias 
B)  amoebae 
C)  cyclosporas 
D)  toxoplasmas 
E)  helminths

Exam 23: Parasitic Protozoa, Helminths, and Arthropod Vectors

Which of the following statements concerning infection with Toxoplasma is FALSE?

The tsetse fly is responsible for the spread of

Trypanosoma cruzi is introduced into the body by

Once infected with Trypanosoma brucei, the patient's immune system cannot clear the infection and develop immunity because the parasite

Apicomplexans reproduce asexually by (mitosis/schizogony/fission).

The primary risk to humans infected with Echinococcus granulosus is

Which of the following is transmitted by the fecal- oral route?

All tapeworms are intestinal parasites that completely lack digestive systems.

The mildest type of malaria is caused by Plasmodium (falciparum/malariae/ovale/vivax).

Triatoma, commonly called "kissing bugs," are vectors of

Which of the following vectors may spend their entire life associated with a single host individual?

Elephantiasis is caused by

Compare and contrast infection with Taenia saginata and Echinococcus granulosus in humans, including the consequences of the infections.

Which of the following is the most important vector of human diseases?

Which of the following is the most common parasitic disease in industrialized nations?

How does the life cycle for the Trypanosoma that causes sleeping sickness differ from the one that causes Chagas' disease?

How are the different types of Schistosoma identified?

Which of the following is the same for both Trypanosoma cruzi and Trypanosoma brucei?

Which of the following parasites is NOT generally microscopic in its mature form, even though microbiologists usually study them?

A Brief History of Microbiology

The Chemistry of Microbiology

Cell Structure and Function

Microscopy, Staining, and Classification

Microbial Metabolism

Microbial Nutrition and Growth

Microbial Genetics

Recombinant Dna Technology

Controlling Microbial Growth in the Environment

Controlling Microbial Growth in the Body: Antimicrobial Drugs

Characterizing and Classifying Prokaryotes

Characterizing and Classifying Eukaryotes

Characterizing and Classifying Viruses, Viroids, and Prions

Infection, Infectious Disease, and Epidemiology

Innate Immunity

Adaptive Immunity

Immunization and Immune Testing

Immune Disorders

Pathogenic Gram-Positive Bacteria

Pathogenic Gram-Negative Cocci and Bacilli

Rickettsias, Chlamydias, Spirochetes, and Vibrios

Pathogenic Fungi

Pathogenic Dna Viruses

Pathogenic Rna Viruses

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