Question 1

A superficial skin infection, caused by Exophiala werneckii, manifested by blackish brown macular patches on the palm of the hand or sole of the foot is called

Accepted Answer

A)  tinea nigra.
B)  black piedra.
C)  eumycotic mycetoma.
D)  chromoblastomycosis. A

Question 2

A KOH preparation of respiratory secretions of a 78-year-old man reveals large, spherical, thick-walled yeast cells 8 to 15 µm in diameter, usually with a single bud that is connected to the parent cell by a broad base.Which fungus will likely be isolated from the culture?

Accepted Answer

A)  Coccidioides immitis
B)  Blastomyces dermatitidis
C)  Histoplasma capsulatum
D)  Paracoccidioides brasiliensis B

Question 3

Features of the fungi as a group include the following:

Accepted Answer

A)  the presence of chitin in the cell wall.
B)  the presence of ergosterol in the cell membrane.
C)  reproduction by means of spores, either asexually or sexually.
D)  heterotopic nature.
E)  All of the above are correct. E

Question 4

The loose intertwined network of basic structural units of the molds which penetrates the substrate from which it obtains the necessary nutrients for growth is called the

Accepted Answer

A)  hyphae.
B)  germ tubes.
C)  pseudohyphae.
D)  mycelium.

Question 5

Hyphae can be defined as

Accepted Answer

A)  loose intertwined network of tubelike projections from which the fungus obtains the nutrients for growth.
B)  tubelike projections that are the basic structural unit of the molds.
C)  premature germ tubes.
D)  a fungal element that is produced when buds elongate and fail to dissociate.

Question 6

Molds that have no pigmentation within the hyphae nor the spores are referred to as

Accepted Answer

A)  hyaline molds.
B)  pauciseptate molds.
C)  dematiaceous molds.
D)  nigraceous molds.

Question 7

The presence of nonbudding, thick-walled spherules containing granular material in a KOH preparation of cerebrospinal fluid usually indicates infection with

Accepted Answer

A)  Coccidioides immitis.
B)  Blastomyces dermatitidis.
C)  Histoplasma capsulatum.
D)  Paracoccidioides brasiliensis.

Question 8

Binary fission is the process of reproduction in yeast that involves

Accepted Answer

A)  cell wall expansion and mitosis, followed by a new cell wall septum created between the two newly formed nuclei.
B)  a portion of the fungus extending above the substrate surface to give rise to fruiting bodies from which asexual spores are borne.
C)  a weakening and outpouching of the yeast cell wall and then formation of a cell wall septum between the mother and daughter yeast cells.
D)  the sexual union of two mother cells to produce a daughter cell that eventually separates from the mother cells.

Question 9

Aerial mycelia are those that serve what main purpose?

Accepted Answer

A)  Nutrient absorption and water exchange
B)  Penetration of host cells
C)  Transfer of genetic material from cell to cell
D)  Give rise to fruiting bodies from which asexual spores are borne

Question 10

The portion of the fungus extending above the substrate surface and which often gives rise to fruiting bodies from which asexual spores are borne is known as

Accepted Answer

A)  vegetative mycelium.
B)  germ tubes.
C)  reproductive hyphae.
D)  aerial mycelia.

Question 11

The reproductive process known as budding is that which involves

Accepted Answer

A)  cell wall expansion and mitosis, followed by a new cell wall septum created between the two newly formed nuclei.
B)  a portion of the fungus extending above the substrate surface to give rise to fruiting bodies from which asexual spores are borne.
C)  a weakening and outpouching of the yeast cell wall and then formation of a cell wall septum between the mother and daughter yeast cells.
D)  the sexual union of two mother cells to produce a daughter cell that eventually separates from the mother cells.

Question 12

Unbranched sporangiophores with rhizoids that appear at the point where the stolon arises at the base of the sporangiophore would usually indicate infection with

Accepted Answer

A)  Cunninghamella.
B)  Absidia.
C)  Mucor.
D)  Rhizopus.

Question 13

The tubular outpouching that occurs in some yeast cells without constriction at its base is referred to as

Accepted Answer

A)  pseudohyphae.
B)  a germ tube.
C)  ascospore.
D)  a bud scar.

Question 14

Large, spherical, thick-walled yeast cells 8 to 15 µm in diameter, usually with a single bud that is connected to the parent cell by a broad base, usually indicates infection with

Accepted Answer

A)  Coccidioides immitis.
B)  Blastomyces dermatitidis.
C)  Histoplasma capsulatum.
D)  Paracoccidioides brasiliensis.

Question 15

Irregular, large, ribbonlike hyphae with no apparent septa, saclike fruiting structures, and rhizoids are seen in which group of molds?

Accepted Answer

A)  Dermatophytes
B)  Zygomycetes
C)  Dimorphic fungi
D)  Dematiaceous fungi

Question 16

Sporangiophores that are singularly produced or branched and have at their tip a round sporangium filled with sporangiospores and the absence of rhizoids or stolons would usually indicate infection with

Accepted Answer

A)  Cunninghamella.
B)  Absidia.
C)  Mucor.
D)  Rhizopus.

Question 17

A chronic granulomatous infection that is characterized by swelling, purplish discoloration, tumorlike deformities of the subcutaneous tissue, and multiple sinus tracts that drain pus containing granules is called

Accepted Answer

A)  tinea nigra.
B)  black piedra.
C)  eumycotic mycetoma.
D)  chromoblastomycosis.

Question 18

Match the fungus with its description. Choose from the following:
-Trichophyton

Accepted Answer

A)  Large spindle-shaped, rough-walled macroconidia with thick walls that contain 4 to 15 septa and small club-shaped microconidia
B)  predominate spherical, teardrop-shaped or club-shaped microconidia and smooth, club-shaped, thin-walled macroconidia with 8 to 10 septa borne singly at the terminal ends of hyphae or on short conidiophores.
C)  numerous smooth, thin-walled, club-shaped, multiseptate macroconidia, which are rounded at the tip and are borne singly on a conidiophore or in groups of two or three, no microconidia, and numerous chlamydoconidia.d.spherical, teardrop-shaped microconidia and rough, club-shaped, thick-walled macroconidia with 8 to 10 septa borne on short conidiophores.

Question 19

The genus Trichophyton is characterized by

Accepted Answer

A)  large spindle-shaped, rough-walled macroconidia with thick walls that contain 4 to 15 septa and small club-shaped microconidia.
B)  predominate spherical, teardrop-shaped or club-shaped microconidia and smooth, club-shaped, thin-walled macroconidia with 8 to 10 septa borne singly at the terminal ends of hyphae or on short conidiophores.
C)  numerous smooth, thin-walled, club-shaped, multiseptate macroconidia, which are rounded at the tip and are borne singly on a conidiophore or in groups of two or three, no microconidia, and numerous chlamydoconidia.
D)  spherical, teardrop-shaped microconidia and rough, club-shaped, thick-walled macroconidia with 8 to 10 septa borne on short conidiophores.

Question 20

Features of the fungi as a group include the following:

Accepted Answer

A)  the presence of chitin in the cell wall.
B)  the absence of ergosterol in the cell membrane.
C)  reproduction by means of transduction and germination.
D)  autotrophic nature.
E)  All of the above are correct.

Exam 47: Laboratory Methods in Basic Mycology

A superficial skin infection, caused by Exophiala werneckii, manifested by blackish brown macular patches on the palm of the hand or sole of the foot is called

A KOH preparation of respiratory secretions of a 78-year-old man reveals large, spherical, thick-walled yeast cells 8 to 15 µm in diameter, usually with a single bud that is connected to the parent cell by a broad base.Which fungus will likely be isolated from the culture?

Features of the fungi as a group include the following:

The loose intertwined network of basic structural units of the molds which penetrates the substrate from which it obtains the necessary nutrients for growth is called the

Hyphae can be defined as

Molds that have no pigmentation within the hyphae nor the spores are referred to as

The presence of nonbudding, thick-walled spherules containing granular material in a KOH preparation of cerebrospinal fluid usually indicates infection with

Binary fission is the process of reproduction in yeast that involves

Aerial mycelia are those that serve what main purpose?

The portion of the fungus extending above the substrate surface and which often gives rise to fruiting bodies from which asexual spores are borne is known as

The reproductive process known as budding is that which involves

Unbranched sporangiophores with rhizoids that appear at the point where the stolon arises at the base of the sporangiophore would usually indicate infection with

The tubular outpouching that occurs in some yeast cells without constriction at its base is referred to as

Large, spherical, thick-walled yeast cells 8 to 15 µm in diameter, usually with a single bud that is connected to the parent cell by a broad base, usually indicates infection with

Irregular, large, ribbonlike hyphae with no apparent septa, saclike fruiting structures, and rhizoids are seen in which group of molds?

Sporangiophores that are singularly produced or branched and have at their tip a round sporangium filled with sporangiospores and the absence of rhizoids or stolons would usually indicate infection with

A chronic granulomatous infection that is characterized by swelling, purplish discoloration, tumorlike deformities of the subcutaneous tissue, and multiple sinus tracts that drain pus containing granules is called

Match the fungus with its description. Choose from the following: -Trichophyton

The genus Trichophyton is characterized by

Features of the fungi as a group include the following: