Question 1

Which of the following best describes the medical significance of the compound shown in the first image (griseofulvin)?

Accepted Answer

It is an antifungal drug used to treat dermatophyte infections.

Question 2

The second image shows a variety of fungal colonies grown on agar plates. Which genus is most likely represented by the majority of these colonies, given their importance in cheese production and antibiotic synthesis?

Accepted Answer

Penicillium

Question 3

The third image is a high-magnification view of a fungal structure. Which structure is shown, and what is its primary function?

Accepted Answer

Conidiophore of Penicillium; asexual spore production

Question 4

The fourth image shows a spoiled orange. Which fungal genus is most commonly responsible for this type of spoilage?

Accepted Answer

Penicillium

Question 5

The fifth image shows moldy bread. Which of the following best explains why consuming bread with this type of mold can be dangerous?

Accepted Answer

The mold may produce mycotoxins or allergens that can cause illness.

Question 6

The sixth image shows a person in protective gear cleaning a mold-infested room. Which health risk is most associated with chronic exposure to indoor molds like those shown?

Accepted Answer

Allergic bronchopulmonary aspergillosis and respiratory disease

Question 7

The seventh image shows ergot on rye. Which of the following compounds is derived from ergot and what is a possible effect of its ingestion?

Accepted Answer

Ergot alkaloids; convulsive CNS symptoms and psychosis

Question 8

The eighth image shows the structure of aflatoxin B1. Which genus of fungi is primarily responsible for producing this compound, and what is its health impact?

Accepted Answer

Aspergillus; potent hepatocarcinogen

Question 9

The ninth image shows the structure of LSD. Which fungal metabolite is chemically related to this compound, and what historical syndrome is associated with its ingestion?

Accepted Answer

Ergot alkaloids; St. Anthony's fire (ergotism)

Question 10

The tenth image shows a microscopic view of budding yeast cells. Which organism is most likely depicted, and what disease can it cause in immunocompromised patients?

Accepted Answer

Candida albicans; systemic candidiasis

Question 11

The eleventh image shows yeast colonies on agar. Which property of Candida albicans is illustrated by the presence of both smooth and rough colonies?

Accepted Answer

Phenotypic switching

Question 12

The twelfth image shows two different morphologies of Candida cells. What is the clinical significance of this phenotypic switching?

Accepted Answer

It allows Candida to evade the immune system and adapt to different host environments.

Question 13

The thirteenth image shows several Candida species on a single agar plate. Which species is currently considered an emerging global health threat due to multidrug resistance?

Accepted Answer

C. auris

Question 14

The fourteenth image shows a stained tissue section with encapsulated yeast cells. Which organism is most likely present, and what is a key virulence factor?

Accepted Answer

Cryptococcus neoformans; anti-phagocytic capsule

Question 15

The fifteenth image shows a patient with a necrotic lesion on the lip. Which fungal infection is most likely responsible, and what is a common risk factor?

Accepted Answer

Mucormycosis; immunocompromised state (e.g., diabetes, AIDS)

Question 16

The sixteenth image is a chest X-ray showing diffuse lung infiltration. Which fungal pathogen is most likely responsible for this finding in an AIDS patient?

Accepted Answer

Pneumocystis jiroveci

Question 17

The seventeenth image shows encapsulated yeast cells in tissue. Which disease is most likely present, and what is a classic symptom?

Accepted Answer

Cryptococcal meningitis; neck stiffness and severe headache

Question 18

The eighteenth image shows the life cycle of Pneumocystis jiroveci. Which stage is responsible for person-to-person transmission?

Accepted Answer

Airborne trophic form

Question 19

The nineteenth image shows tuberculate macroconidia. Which fungal pathogen produces these structures, and what disease does it cause?

Accepted Answer

Histoplasma capsulatum; histoplasmosis

Question 20

The twentieth image shows rectangular arthrospores. Which fungus produces these, and what is a key feature of its infection cycle?

Accepted Answer

Coccidioides immitis; formation of spherules in the lungs

lec 16

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