Question 1

A patient presents with severe itching around the anus, especially at night. Microscopic examination of a perianal swab reveals oval eggs. Which of the following organisms is most likely responsible for this infection?

Accepted Answer

Enterobius vermicularis

Question 2

A laboratory technician observes a multicellular, segmented organism under the microscope. The organism lacks a digestive tract and is identified as a human intestinal parasite. Which group does this organism belong to?

Accepted Answer

Cestode

Question 3

Which of the following statements best explains why resistance to antiparasitic drugs generally develops more slowly than resistance to antibiotics in bacteria?

Accepted Answer

Parasites have longer generation times than bacteria.

Question 4

A fungus is observed to grow as a yeast at 37°C and as a mold at 25°C. What is the term for this phenomenon?

Accepted Answer

Dimorphism

Question 5

A patient with HIV develops white, patchy lesions in the mouth. Microscopy reveals budding yeast cells and pseudohyphae. Which organism is most likely responsible?

Accepted Answer

Candida albicans

Question 6

Which of the following best describes the structure and function of a mycelium?

Accepted Answer

A mass of hyphae forming the vegetative body of a fungus

Question 7

A researcher is studying a parasite that uses a snail as an intermediate host and has a leaf-shaped body with an incomplete digestive tract. Which group does this parasite belong to?

Accepted Answer

Trematode

Question 8

Which of the following statements about fungal infections (mycoses) is TRUE?

Accepted Answer

Most true pathogenic fungi enter the body through inhalation of spores.

Question 9

A protozoan parasite is known to evade the host immune system by frequently changing its surface antigens. Which organism exhibits this strategy?

Accepted Answer

Trypanosoma brucei

Question 10

Which of the following best describes the hygiene hypothesis?

Accepted Answer

Exposure to certain microbes or parasites may influence the development of allergic or autoimmune diseases.

Question 11

A patient is diagnosed with malaria. Which of the following statements about the causative organism is CORRECT?

Accepted Answer

It is an apicomplexan protozoan.

Question 12

Which of the following drugs is NOT typically used to treat fungal infections?

Accepted Answer

Penicillin

Question 13

A multicellular organism with a chitinous exoskeleton, segmented body, and open circulatory system is observed. To which group does it belong?

Accepted Answer

Arthropod

Question 14

Which of the following best describes the definitive host in a parasitic life cycle?

Accepted Answer

The host in which the parasite reaches its mature, sexually reproducing stage

Question 15

A sample from a patient with a skin infection is found to contain a dermatophyte. Which of the following is the most likely diagnosis?

Accepted Answer

Tinea

Question 16

Which of the following statements about tapeworms (cestodes) is TRUE?

Accepted Answer

They are segmented and lack a digestive system.

Question 17

A student is using a compound microscope to view a fungal sample. Which focusing method should be used first?

Accepted Answer

Coarse focus

Question 18

Which of the following best describes the relationship in a lichen?

Accepted Answer

Fungus and algae or cyanobacteria

Question 19

A patient is infected with a protozoan that causes diarrhea after drinking contaminated water. The organism is identified as having a cyst stage. Which is the most likely causative agent?

Accepted Answer

Giardia lamblia

Question 20

Which of the following statements about fungal reproduction is CORRECT?

Accepted Answer

Fungi can reproduce both sexually and asexually.

Eukaryotic Microbes and Parasites: Study Guide

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