Mycology Dimorphic Fungi

39 Questions | Total Attempts: 705

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Mycology Dimorphic Fungi


Questions and Answers
  • 1. 
    With dimorphic pathogens the Yeast forms are found in tissue and in culture at ______ degrees celsius.
    • A. 

      25-30

    • B. 

      37

  • 2. 
    When a dimorphic pathogen is isoleated, we try and convert it to the  "_______" temperature.
    • A. 

      Higher

    • B. 

      Lower

    • C. 

      Opposite

    • D. 

      Same

  • 3. 
    Evidence suggests that each Dimorphic Fungi is a saprophyte in soil. But are they part of the normal flora in man?
    • A. 

      Yes

    • B. 

      No

  • 4. 
    Primary infection in most cases of dimorphic fungi is _________.
    • A. 

      Cardiac infection

    • B. 

      Gastro infection

    • C. 

      Pulmonary infection

  • 5. 
    Primary infection of dimorphic fungi is contracted through inhalation of what?
    • A. 

      Conidia

    • B. 

      Oocytes

    • C. 

      Larvae

  • 6. 
    Infection in general with dimorphic fungi are typically what with immunocompetent patients?
    • A. 

      Asymptomatic

    • B. 

      Symptomatic

  • 7. 
    Dimorphic pathogens are pathogens of the ____.
    • A. 

      Heart

    • B. 

      Lungs

    • C. 

      Intestine

    • D. 

      Skin

  • 8. 
    Dimorphic pathogens are typically transported by what route?
    • A. 

      Blood

    • B. 

      Food

    • C. 

      Air

  • 9. 
    Slides Cultures can or should be done with Dimorphic fungi.
    • A. 

      True

    • B. 

      False

  • 10. 
    Brain heart infusion agar with blood is used for the conversion to the _____ phase.
    • A. 

      Yeast

    • B. 

      Mold

    • C. 

      Larva

  • 11. 
    Are skin tests useful for immunocompetent individuals when dealing with dimorphi fungi?
    • A. 

      Yes

    • B. 

      No

  • 12. 
    Choose the Geographical description that matches the fungi.Sporothrix schenckii
    • A. 

      Central and South America, Mexico, eastern Europe and in the north-central US

    • B. 

      Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers

    • C. 

      North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries

    • D. 

      Northwestern, central and southwestern South America, Central America and southern Mexico

    • E. 

      Areas of Southeast Asia

  • 13. 
    Choose the Geographical description that matches the fungi.Histoplasma capsulatum
    • A. 

      Central and South America, Mexico, eastern Europe and in the north-central US

    • B. 

      Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers

    • C. 

      North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries

    • D. 

      Northwestern, central and southwestern South America, Central America and southern Mexico

    • E. 

      Areas of Southeast Asia

  • 14. 
    Choose the Geographical description that matches the fungi.Blastomyces dermatitidis
    • A. 

      Central and South America, Mexico, eastern Europe and in the north-central US

    • B. 

      Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers

    • C. 

      Endemic in North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries

    • D. 

      Northwestern, central and southwestern South America, Central America and southern Mexico

    • E. 

      Areas of Southeast Asia

  • 15. 
    Choose the Geographical description that matches the fungi.Paracoccidioides brasiliensis
    • A. 

      Central and South America, Mexico, eastern Europe and in the north-central US

    • B. 

      Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers

    • C. 

      Endemic in North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries

    • D. 

      Is endemic in northwestern, central and southwestern South America, Central America and southern Mexico

    • E. 

      Areas of Southeast Asia

  • 16. 
    Choose the Geographical description that matches the fungi.Penicillium marneffei
    • A. 

      Central and South America, Mexico, eastern Europe and in the north-central US

    • B. 

      Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers

    • C. 

      Endemic in North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries

    • D. 

      Is endemic in northwestern, central and southwestern South America, Central America and southern Mexico

    • E. 

      Areas of Southeast Asia

  • 17. 
    Sporothrix schenckii most commonly associated with gardening working the soil; nicknamed "_________".
    • A. 

      Tulip farmer's disease

    • B. 

      Rose farmer's disease

    • C. 

      Rose gardener's disease

    • D. 

      Sunflower farmer's disease.

  • 18. 
    Sporothrix schenckii grows rapidly becoming mature within ____ days.
    • A. 

      5

    • B. 

      10

    • C. 

      21

    • D. 

      28

  • 19. 
    At 25-30 degrees celsius, the colony develops as the ______ form.
    • A. 

      Yeast

    • B. 

      Mold

  • 20. 
    Microscopically, at 25-30 degrees celsius, ______ produces deleicate, thin septate and branching hyphae that are hyaline. Slender, tapering conidiophores arise at right angles to the hyphae that bear many small tear-shaped or almost round conidia on delicate threadlike denticles forming a "rosette-like" cluster in young cultures; conidia also form singly along the hyphaeAt 35- 37 degrees celsius, round, oval and fusiform budding cells of various sizes often called "cigar bodies" are seen.What dimorphic fungi am I describing?
    • A. 

      Sporothrix schenckii

    • B. 

      Histoplasma capsulatum

    • C. 

      Blastomyces dermatitidis

    • D. 

      Paracoccidioides brasiliensis

    • E. 

      Penicillium marneffei

  • 21. 
    At 25-30 degrees celsius on SDA, colonies are white to brown or pinkish with a fine, desne cottony texture; reverse is white but sometimes yellow or orange tanAt 35-37 degrees celsius on BHI, colonies are moist, white and yeastlike; the yeast phase is inhibited  by cycloheximideMicroscopically, at 25-30 degrees celsius in young cultures, septate hyphae are seen; they bear round to pear-shaped smooth or occasionally spiny microconidia on short branches or dierectly on the sides of the hyphaeAfter several weeks, thick-walled, round macroconidia form; they are tuberulate, knobby or have short cylindrical projections.What dimorphic organism is being described?
    • A. 

      Sporothrix schenckii

    • B. 

      Histoplasma capsulatum

    • C. 

      Blastomyces dermatitidis

    • D. 

      Paracoccidioides brasiliensis

    • E. 

      Penicillium marneffei

  • 22. 
    At 25-30 degrees celsius on SDA, it is at first yeastlike, then prickly and finally very cottony with white aerial mycelium, mycelium turns tan or brown with age with the reverse being tan.At 35-37 degrees celsius, colonies are cream to tan in color, heaped or wrinkled and waxy; sen best on BHI.Microscopically, at 25-30 degrees on SDA, septate hyphae are seen; hyphae have short or long conidiophores with round to pear shaped conidiaConidia can develop either at the apex of the conidiophore giving a lollipop-like appearance or directly along the hyphaeWhat organism am I describing?
    • A. 

      Sporothrix schenckii

    • B. 

      Histoplasma capsulatum

    • C. 

      Blastomyces dermatitidis

    • D. 

      Paracoccidioides brasiliensis

    • E. 

      Penicillium marneffei

  • 23. 
    As with the other dimorphic fungi, mold growth occurs at 25-30 degrees celsius and yeat growth at 35-37 degrees celsiusMacroscopically, at 25-30 degrees celsius on SDA, the colony is white, heaped, compact, usually folded and almost glabrous or with a short nap of white aerial mycelium that often turns brown with age; reverse is light or brownishAt 37 degrees celsius, the yeast phase on BHI is heaped, cream to tan in color, mosit and soft; as the colony ages, it becomes more yeastlike and waxy.What dimorphic organism am I talking about?
    • A. 

      Sporothrix schenckii

    • B. 

      Histoplasma capsulatum

    • C. 

      Blastomyces dermatitidis

    • D. 

      Paracoccidioides brasiliensis

    • E. 

      Penicillium marneffei

  • 24. 
    At 25-30 degrees celcisus smooth condiophores with 4-5 terminal metulae, each metula bearing 4-6 phialidesConidia are smooth or slightly rough and oval and form chains; short narrow extensions connect the conidiaConidia, when incubated at 35-37 degrees Celsius, form hyphal elements that will fragment at the septa, producing single-celled round to oval arthroconidia; these are referred to as yeastlike cells.No buds are produced; arthroconidia will reproduce by fission.What dimorphic organism am I talking about?
    • A. 

      Sporothrix schenckii

    • B. 

      Histoplasma capsulatum

    • C. 

      Blastomyces dermatitidis

    • D. 

      Paracoccidioides brasiliensis

    • E. 

      Penicillium marneffei

  • 25. 
    This organism forms "rosette-like" cluster in young cultures; conidia also form singly along the hyphae.At 35-37 degrees, round, oval and fusiform budding cells of various sizes often called, "cigar bodies" are seen.
    • A. 

      Sporothrix schenckii

    • B. 

      Histoplasma capsulatum

    • C. 

      Blastomyces dermatitidis

    • D. 

      Paracoccidioides brasiliensis

    • E. 

      Penicillium marneffei

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