Question 1

Which of the following protozoans is responsible for causing African Sleeping Sickness, and what is its primary mode of transmission?

Accepted Answer

Trypanosoma brucei; transmitted by the tsetse fly

Question 2

Which of the following statements best describes the reproductive strategy of cestodes (tapeworms)?

Accepted Answer

They are monoecious or hermaphroditic, with both male and female reproductive organs in one worm.

Question 3

A patient presents with severe diarrhea, cramping, and fatigue after drinking untreated stream water. Microscopy reveals a flagellated protozoan with a ventral sucker disk. Which organism is most likely responsible?

Accepted Answer

Giardia intestinalis

Question 4

Which of the following best explains why Trichomonas vaginalis infections are not typically transmitted via contaminated water?

Accepted Answer

It lacks a cyst stage and cannot survive long outside the human host.

Question 5

Which of the following is a correct pairing of locomotion structure and organism?

Accepted Answer

Pseudopodia – Amoeba

Question 6

A child presents with perianal itching, especially at night. Microscopic examination reveals eggs deposited around the anus. Which parasite is most likely responsible?

Accepted Answer

Enterobius vermicularis

Question 7

Which of the following best describes the life cycle of Schistosoma mansoni?

Accepted Answer

Cercariae penetrate human skin, mature in the circulatory system, and eggs are released in feces.

Question 8

Which of the following is a distinguishing feature of nematodes compared to trematodes and cestodes?

Accepted Answer

They have a complete digestive system with mouth, intestine, and anus.

Question 9

A woman is diagnosed with toxoplasmosis during pregnancy. Which of the following is the most likely source of her infection?

Accepted Answer

Contact with cat feces containing oocysts

Question 10

Which of the following arthropods is correctly matched with the disease it transmits?

Accepted Answer

Tsetse fly – African Sleeping Sickness

Question 11

Which of the following statements about protozoan cysts is TRUE?

Accepted Answer

Cysts are resistant forms that allow survival outside the host for extended periods.

Question 12

Which of the following best describes the difference between binary fission and schizogony in protozoan reproduction?

Accepted Answer

Binary fission produces two daughter cells; schizogony produces many daughter cells from one parent.

Question 13

Which of the following is a characteristic of all cellular living organisms?

Accepted Answer

Contain ribosomes for protein synthesis

Question 14

A patient presents with fever, headache, and confusion after swimming in a warm freshwater lake. The organism enters the CNS via the nose. Which parasite is most likely responsible?

Accepted Answer

Naegleria fowleri

Question 15

Which of the following best explains why Plasmodium species are difficult to eradicate from human populations?

Accepted Answer

They have complex life cycles involving both human and mosquito hosts.

Question 16

Which of the following is a correct match between a locomotion structure and its function?

Accepted Answer

Pseudopodia – cell extensions that flow in the direction of travel

Question 17

Which of the following best describes the role of arthropods in the transmission of infectious diseases?

Accepted Answer

They serve as vectors, transmitting infectious microbes between hosts.

Question 18

Which of the following is a distinguishing feature of the protist kingdom compared to other eukaryotic kingdoms?

Accepted Answer

Protists include single-celled eukaryotes that lack a cell wall.

Question 19

Which of the following best explains why Toxoplasma gondii infection is particularly dangerous for pregnant women?

Accepted Answer

It can cross the placenta and cause congenital defects in the fetus.

Parasitology: Protozoans, Helminths, and Arthropods in Microbiology

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