Chapter 21

In the malarial parasite's life cycle, _______ are released from infected liver cells.

merozoites

In the malarial parasite's life cycle __________ are produced within female Anopheles mosquitoes

sporozoites

In the malarial parasite's life cycle humans become infected when a female Anopheles mosquito injects ________________ while taking a blood meal.

sporozoites

In the malarial parasite's life cycle, merozoites initially mature into __________ within red blood cells.

trophozoites

Humans develop malaria after the injection of Plasmodium _____ into the bloodstream by an infected female Anopheles mosquito when she takes a blood meal

Sporozoites

In the malarial parasite's life cycle, female Anopheles mosquitoes become infected when they ingest male and female ____________ (at least one of each) while taking a blood meal.

gametocytes

A disease known as PAM is caused by a protozoan in the category of protozoa known as _______________.

Amebas

Protozoa in the category of protozoa known as _______________ move by means of pseudopodia.

Amebas

You are visiting a friend whose parents raise pigs. Which of the following diseases are you MOST likely to acquire by drinking well water at their farm?

Balantidiasis

Which of the following associations is incorrect?

Chagas' disease....mosquito

In the category of protozoa known as _______________, only one protozoan causes human disease.

Ciliates

You are working on a cattle ranch. Which of the following diseases are you MOST apt to acquire as you perform your duties at the ranch?

Cryptosporidiosis

African trypanosomiasis and American trypanosomiasis are transmitted by the same type of arthropod vector.

False (African trypanosomiasis is transmitted by a tsetse fly, whereas American trypanosomiasis is transmitted by a reduviid bug)

In the malarial parasite's life cycle, humans serve as definitive hosts

False (in the malaria parasite's life cycle, humans serve as intermediate hosts and mosquitoes serve as definitive hosts)

Scabies is caused by an insect.

False (scabies is caused by an arachnid—specifically, a mite; arachnids are not insects)

The amebae that cause amebic keratitis and PAM are good examples of obligate parasites.

False (the amebae that cause these diseases are good examples of facultative parasites)

African trypanosomiasis, American trypanosomiasis, giardiasis, and trichomo-niasis are caused by protozoa in the category of protozoa known as _______________.

Flagellates

Which of the following protozoal diseases is NOT transmitted via an arthropod vector?

Giardiasis

These Plasmodium life cycle stages must by ingested by a female Anopheles mosquito for the Plasmodium life cycle to continue in the mosquito.

Male and female gametocytes

Which of the following is an example of an infectious disease that is caused by a facilitative parasite?

PAM

Cryptosporidiosis, malaria, and toxoplas-mosis are caused by protozoa in the category of protozoa known as _______________.

Sporozoa

Which of the following protozoal diseases are you MOST likely to acquire by eating a rare hamburger?

Toxoplasmosis

Which of the following protozoal diseases is LEAST likely to be transmitted via an infected food handler who fails to wash his or her hands after using the bathroom?

Toxoplasmosis

Which of the following protozoal diseases is LEAST likely to be transmitted via blood transfusion?

Trichomoniasis

In a parasite's life cycle, it is possible for a particular arthropod to serve as both a host and a biologic vector.

True

In a parasite's life cycle, the definitive host harbors the adult or sexual stage of the parasite or the sexual phase of the life cycle.

True

It is possible to acquire cryptosporidiosis, cyclosporiasis, and toxoplasmosis by ingesting oocysts.

True

Toxoplasmosis could be acquired by eating raw or rare meat.

True

Trichomonas vaginalis cannot survive very long outside of the human body because it has no cyst form.

True

When causing infections, parasitic protozoa and helminths are endoparasites.

True