Micro - Mycology I (trans)

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Questions and Answers

What type of organism is Malassezia Furfur?

Virus

Protozoa

Fungi (correct)

Bacteria

How do unicellular fungi like Malassezia Furfur reproduce?

Budding (correct)

Spore formation

Fragmentation

Binary fission

What is the defining feature of septate hyphae?

Consists of multiple nuclei

Does not have cross walls

Has divisions called septa (correct)

Is unicellular

Which type of hyphae lacks septa or cross walls?

Both B and C Signup and view all the answers

Which agar medium is commonly used for culturing fungi?

Sabouraud Dextrose Agar Signup and view all the answers

What cellular structure is typically found in all eukaryotic cells?

Nucleus Signup and view all the answers

What is the main action of antifungal drugs?

Disrupt the cell wall or membrane of fungi Signup and view all the answers

What is a characteristic of filamentous fungi?

Multicellular formation Signup and view all the answers

Which of the following is NOT a factor for fungal growth and survival?

Presence of metallic elements Signup and view all the answers

Which of the following statements about fungi is TRUE?

Fungi have a cell membrane with the presence of sterols Signup and view all the answers

What is the correct diagnostic approach to confirm dermatophyte infection?

Prepare skin scrapings using 20% KOH, and look for hyaline septate hyphae under the microscope Signup and view all the answers

Griseofulvin is primarily used to treat which of the following conditions?

Dermatophyte infections Signup and view all the answers

What is the primary function of ketoconazole?

To block fungal cell membrane synthesis Signup and view all the answers

Which of the following is NOT true about Epidermophyton floccosum?

It can cause infections in the beard Signup and view all the answers

What characteristic distinguishes Trichophyton species in infections?

It primarily affects the hair and skin Signup and view all the answers

What is the primary mechanism of action of Azoles?

Inhibit ergosterol synthesis Signup and view all the answers

What effect does inhalation of fungal spores have?

Triggers an immediate hypersensitivity response Signup and view all the answers

Which drug inhibits cellular RNA polymerase?

Flucytosine Signup and view all the answers

Which of the following is a potent hepatotoxin?

Aflatoxin Signup and view all the answers

What type of mycotic infection most commonly affects the skin and nails?

Dermatophytosis Signup and view all the answers

Which method can visualize hyphae in fungal infections?

KOH preparation Signup and view all the answers

Which drug is known for disrupting the mitotic spindle by binding to tubulin?

Griseofulvin Signup and view all the answers

What is the primary characteristic of the majority of fungi?

Obligate or facultative aerobes Signup and view all the answers

Which of the following is classified as a type of mycosis with the highest incidence?

Candidiasis Signup and view all the answers

Which drug is primarily used to inhibit β-glucan synthesis?

Caspofungin Signup and view all the answers

What is the characteristic location of spores in Ectothrix infections?

Outside the hair shaft Signup and view all the answers

Which condition is caused by the fungus Trichophyton rubrum?

Tinea Barbae Signup and view all the answers

What is the result of a positive Wood's Lamp test?

Shows glowing fungi Signup and view all the answers

What type of infection is characterized by spores located inside the hair shaft?

Endothrix Signup and view all the answers

Which of the following substances is used for microscopy in fungal diagnosis?

Methylene blue with KOH Signup and view all the answers

Which organism is associated with a negative result on the Wood's Lamp test?

Trichophyton tonsurans Signup and view all the answers

Which type of superficial mycosis is known to be part of normal adult skin flora?

Malassezia furfur Signup and view all the answers

What substrates are commonly associated with Tinea Barbae infection?

Towels and razors Signup and view all the answers

What type of fungus is characterized as being lipophilic?

Malassezia furfur Signup and view all the answers

In microscopy, what characteristic is observed for the ectothrix infection?

Spores surrounding hair shafts Signup and view all the answers

What is the most common fungus associated with eumycetoma?

Madurella mycetomatis Signup and view all the answers

Which microscopy technique uses KOH for identifying fungal hyphae?

Microscopy for eumycetoma Signup and view all the answers

Which stain shows fungal hyphae in red color?

H&E stain Signup and view all the answers

What type of culture medium is used to identify specific fungi in tissue biopsies?

Sabouraud’s dextrose agar (SDA) Signup and view all the answers

Which microscopy technique reveals thin long-branched hyphae in black?

Grocott’s Methenamine Silver (GMS) stain Signup and view all the answers

Which of the following describes Tinea versicolor in diagnostic features?

Spaghetti meatballs arrangement Signup and view all the answers

What characteristic is associated with Tinea nigra palmaris?

Dark pigmented hyphae Signup and view all the answers

Which of the following is NOT a common specimen used for diagnosing eumycetoma?

Blood sample Signup and view all the answers

What kind of hyphae are observed microscopically in eumycetoma?

Thin long-branched hyphae Signup and view all the answers

What is a primary feature to look for in tissue biopsy of subcutaneous mycoses?

Tissue form of fungi Signup and view all the answers

Study Notes

Malassezia Furfur

Part of the normal adult skin flora
Lipophilic yeast
Microscopic characteristics:
- Thin long-branched hyphae
- Well-defined walls

Laboratory Diagnosis of Malassezia Furfur

Specimen: Tissue biopsy
Microscopy: Use KOH to look for hyphae.

Treatment of Malassezia Furfur

Griseofulvin
Ketoconazole
Surgical excision (if cannot be treated)

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Description

Test your knowledge on Malassezia Furfur, a lipophilic yeast that is part of the normal skin flora. This quiz covers its microscopic characteristics, laboratory diagnosis techniques, and treatment options, including antifungal medications and surgical interventions.