Question 1

Which of the following fungi is industrially important for the production of citric acid?

Accepted Answer

Aspergillus niger

Question 2

A patient presents with severe diarrhea after drinking contaminated water while traveling. Microscopic examination reveals a flagellated protozoan. Which organism is most likely responsible?

Accepted Answer

Giardia lamblia

Question 3

Which of the following best describes the life cycle of Plasmodium species, the causative agent of malaria?

Accepted Answer

Complex life cycle involving both asexual reproduction in humans and sexual reproduction in mosquitoes

Question 4

Which of the following is a characteristic feature of protozoa?

Accepted Answer

They are eukaryotic and usually unicellular

Question 5

A researcher is studying a protozoan that moves using cilia and causes dysentery in humans. Which organism is being studied?

Accepted Answer

Balantidium coli

Question 6

Which of the following statements about helminths is correct?

Accepted Answer

They have complex life cycles often involving multiple hosts

Question 7

A patient is diagnosed with schistosomiasis. Which type of helminth is responsible for this disease?

Accepted Answer

Trematode

Question 8

Which of the following is a correct match between a protozoan and the disease it causes?

Accepted Answer

Entamoeba histolytica – Amoebic dysentery

Question 9

Which of the following best explains why arthropods are important in the transmission of infectious diseases?

Accepted Answer

They act as vectors, transmitting pathogens between hosts

Question 10

A patient presents with anemia and abdominal discomfort. Laboratory analysis reveals the presence of eggs in the stool, and the organism is identified as a nematode. Which of the following is most likely the causative agent?

Accepted Answer

Ascaris lumbricoides

Question 11

Which of the following protozoa is transmitted by the tsetse fly and causes African sleeping sickness?

Accepted Answer

Trypanosoma brucei

Question 12

Which of the following best describes the role of cyst formation in protozoa?

Accepted Answer

Cysts enable protozoa to survive adverse environmental conditions

Question 13

Which of the following is a correct pairing of a medically important protozoan and its mode of motility?

Accepted Answer

Giardia – Flagella

Question 14

A child presents with perianal itching, especially at night. Microscopic examination of a tape test reveals eggs of a nematode. Which organism is most likely responsible?

Accepted Answer

Enterobius vermicularis

Question 15

Which of the following statements about cestodes is correct?

Accepted Answer

They are flatworms with segmented bodies and absorb nutrients through their skin

Question 16

Which of the following is a correct statement about the economic effects of fungi?

Accepted Answer

Fungi have both beneficial and harmful economic impacts

Question 17

A patient is diagnosed with giardiasis. Which of the following best describes the transmission and life cycle of Giardia lamblia?

Accepted Answer

Transmitted by ingestion of cysts in contaminated water; trophozoite stage in the intestine

Question 18

Which of the following best explains why Plasmodium species require both humans and mosquitoes to complete their life cycle?

Accepted Answer

Asexual reproduction occurs in humans, and sexual reproduction occurs in mosquitoes

Question 19

Which of the following is a correct example of an arthropod acting as a biological vector?

Accepted Answer

A mosquito transmitting Plasmodium species to humans

Question 20

Which of the following best describes the difference between trematodes and nematodes?

Accepted Answer

Trematodes are flatworms with leaf-shaped bodies; nematodes are roundworms with cylindrical bodies

Protists, Fungi, Helminths, and Arthropods: Microbiology Study Notes

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