Question 1

Which of the following best explains why mycoses are among the most difficult diseases to treat in humans?

Accepted Answer

Fungi are biochemically similar to human cells, making selective toxicity difficult.

Question 2

A patient presents with a chronic cough and chest pain after spelunking in caves in the Ohio River Valley. Microscopy reveals budding yeast inside macrophages. Which fungal pathogen is most likely responsible?

Accepted Answer

Histoplasma capsulatum

Question 3

Which of the following antifungal drugs acts by binding to ergosterol and forming pores in the fungal cell membrane?

Accepted Answer

Amphotericin B

Question 4

A laboratory technician is working with a dimorphic fungus. Which of the following best describes the organism’s growth forms?

Accepted Answer

Mold in the environment, yeast in the human body

Question 5

Which of the following is a major risk factor for developing opportunistic mycoses?

Accepted Answer

Receiving immunosuppressive therapy after organ transplantation

Question 6

A patient with AIDS develops meningitis. India ink staining of cerebrospinal fluid reveals encapsulated yeast. Which organism is most likely responsible?

Accepted Answer

Cryptococcus neoformans

Question 7

Which of the following best describes the mechanism of action of griseofulvin?

Accepted Answer

Interferes with microtubule formation and mitosis

Question 8

Aflatoxins are mycotoxins produced by certain fungi. Which of the following is a significant health risk associated with chronic aflatoxin exposure?

Accepted Answer

Liver cancer

Question 9

Which of the following statements about dermatophytes is TRUE?

Accepted Answer

They are the only major group of fungi that are commonly contagious between humans.

Question 10

A patient presents with red, ring-like lesions on the trunk and arms. Microscopy reveals hyphae in the outer layers of skin. Which of the following is the most likely diagnosis?

Accepted Answer

Tinea corporis

Question 11

Which of the following best explains why antifungal vaccines are difficult to develop?

Accepted Answer

Fungal infections are rare in immunocompetent individuals and most severe cases occur in immunosuppressed patients.

Question 12

A patient with a history of tuberculosis develops a mass of fungal hyphae in a lung cavity. Which disease is most likely present?

Accepted Answer

Noninvasive aspergilloma

Question 13

Which of the following is the most common clinical manifestation of cryptococcal infection in AIDS patients?

Accepted Answer

Cryptococcal meningitis

Question 14

Which of the following is the drug of choice for treating Pneumocystis pneumonia?

Accepted Answer

Trimethoprim and sulfamethoxazole

Question 15

A patient presents with creamy white, curdlike vaginal discharge and burning. She recently completed a course of broad-spectrum antibiotics. Which organism is most likely responsible?

Accepted Answer

Candida albicans

Question 16

Which of the following best describes the transmission of most systemic mycoses caused by true pathogenic fungi?

Accepted Answer

Inhalation of fungal spores from the environment

Question 17

A patient develops severe liver damage after eating wild mushrooms. Which of the following best explains the mechanism of toxicity of the 'death cap' mushroom?

Accepted Answer

Inhibition of mRNA synthesis

Question 18

Which of the following is a distinguishing feature of Paracoccidioides brasiliensis in clinical samples?

Accepted Answer

Budding yeast in a 'steering wheel' arrangement

Question 19

Which of the following best describes the clinical significance of Pneumocystis jiroveci infection in AIDS patients?

Accepted Answer

Its presence is almost diagnostic for AIDS.

Question 20

Which of the following is the primary food source for dermatophytes infecting human skin, hair, or nails?

Accepted Answer

Keratin

Pathogenic Fungi: Medical Mycology and Fungal Diseases

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