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Mycology intern SQ

QuestionAnswer
porangiospores are produced by a single class of fungi called the: a) Ascomycetes b) Basidiomycetes c) Zygomycetes d) Deuteromycetes C
Fungal organisms that produce darkly pigmented hyphae are referred to as: a) hyaline b) aseptate c) septate d) dematiaceous D
gen charS of fungi, one of the following is NOT correct: a) their cellular organelles are membranous-bound b) they possess a cell wall composed of the polysaccharide pectin c) their cell membranes are rich in ergosterol d) they are achlorophyllous B
The fxn of 10% KOH in the direct exam. of a specimen for fungal elements is: a) to fix fungal elements permanently b) to digest & dissolve cellular debis c) to eradicate bacterial organisms d) to stain the existing hyphae B
The production of diagnostic reproductive structures by fungi is enhanced by: a) incubation in CO2 conditions b) incubation at 42C c) providing nutritionally enriched media d) providing nutritionally poor media D
One of the following is NOT a sexual spore: a) zygospore b) ascospore c) sporangiospore d)basidiospore C
A true hyphae, which is divided into compartments by crosswalls, is called: a) imperfect b) perfect c) nonseptate d) septate D
Multicellular filamentous colonies of fungi are called: a) molds b) yeasts c) coenocytic d) dematiaceous A
A dimorphic fungus is one that: a) changes its form on different types of media b) changes its form as a result of different temps c) starts to grow as a mold, but becomes more yeast-like d) exhibits yeast & mold forms at the same time B
Yeasts reproduce by a process called: a) binary fission b) budding c) meiosis d) conjunction B
Thick-walled asexual spores that form terminally or w/in hyphal segments are: a) arthroconidia b) blastoconidia c) chlamydoconidia d) sporangia C
Colonies of mold hyphae are called: a) macroconidia b) arthroconidia c) yeasts d) mycelia D
Sabourad dextrose agar is an example of: a) primary fungal isolation media b) media for observation of microscopic morphology c) special-purpose media d) nutritionally deficient media A
The India ink stain is combined w/ CSF to ID: a) Coccidiodes immitis b) Cryptococcus neoformans c) Candida albicans d) Histoplasma capsulatum B
The germ tube test is used to presumptively ID: a) Cryptococcus neoformans b) Candida albicans c) Candida tropicalis d) Rhizopus B
Fungi produce a variety of pigments. Pigment characteristics appear: a) on the top of the colony b) on the underside of the colony c) diffused into the medium d) all of the above D
Microscopic observations of fungi include all of the following EXCEPT: a) type of hyphae b) type of spores c) manner in which the spores are produced d) type of topography D
All of the following are acceptable specimens for fungal culture EXCEPT: a) freshly passed stool b) 24-hr urine specimen c) sputum specimen d) CSF specimen B
Yeast & the yeast phase of dimorphic fungi grow best: a) at room temp b) in a range between 26C & 30C c) at 35C to 37C d) in a CO2-enriched environment C
In mycology, topography refers to: a) pigment production b) the surfact features of the colonies c) the texture of the colonies d) rate of growth B
Infection around the hair shaft w/ a soft light, nodular hyphal mass is characteristic of: a) Trichosporon beigelii b) Malassezia furfur c) Piedraia hortae d) Phaeoannellomyces werneckii A
Tinea nigra is the common disease name for infection w/ a) Microsporum audouinii b) Phaeoannellomyces werneckii c) Trichophyton rubrum d) Epidermophyton floccosum B
Organisms in this genus of yeast produce skin infections that are very similar to dermatophyte infections: a) Epidermophyton b) Cryptococcus c) Candida d) Malessezia C
An organism commonly assoc. w/ tinea cruris in the US is: a) Trichophyton mentagrophytes b) Epidermophyton flocossum c) Microsporum audouinii d) Microsporum canis B
The most common of the dermatophyte infections is: a) athlete's foot b) jock itch c) nail infections d) scalp infections A
All of the following genera contain species that caouse dermatophyte infections EXCEPT: a) Epidermophyton b) Microsporum c) Trichophyton d) Trichosporon D
One of the following is NOT considered a superficial fungal infection: a) tinea nigra b) black piedra cP white piedra d) tinea pedis D
A mycetoma is: a) a collection of sclerotic bodies b) a type of ringworm c) a fungal brain tumor d) a destructive fungal abscess of the extremity D
Phaeohyphomycosis is a term that refers to fungal infections that: a) cause creeping eruptions b) are waterborne c) have dermatiaceous, septate mycelia in the tissues d) have hyaline, septate hyphae C
The name given to a dimorphic fungi which causes a lymphocutaneous infection: a) actinomycotic mycetoma b) chromoblastomycosis c) sporotrichosis d) neurotropic C
The most virulent of all fungal agents is: a) Histoplasma capsulatum b) Sporothrix schenckii c) Coccidioides immitis d) Blastomyces dermatitidis C
Primary infections for the systemic dimorphic pathogens are: a) pulmonary b) cutaneous c) urogenital d) gastrointestinal A
"Thrush" is caued by: a) Cryptococcus neoformans b) Candida albicans c) Coccidioides immitis d) Trichophyton rubrum B
An organism that rarely infects a normal humasn but may cause severe infection in the immunosuppressed pt is called; a) a true pathogen b) an opportuinistic pathogen c) transient flora d) a contaminant B
A pt is admitted to the hospital w/ a tentative diagnosis of fungas ball. The fungal cultures reveal a fast-growing mold w/ septate hyphae, which confirms the causative agent: a) Rhizopus b) Aspergillus c) Histoplasma d) Candida B
Vaginal cnadidiasis is often a sequela to antibiotic therapy due to: a) an allergic rxn b) an overgrowth of bacterial organisms c) an upset of the ecological balance of vaginal flora C
A rapidly progressive infection of immunocompromised pts that involves invastion of blood vessels is: a) Candidiasis b) Blastomycosis c) Zygomycosis d) Cryptococcosis C
All of the following are characteristics of the Zygomycetes EXCEPT: a) rhizoids b) sporangia c) rapid growth d) phialides D
The genus that is characterized by aseptate hyphae, rhizoids, & internodal sporangiophores w/ pointed columella & prominent aphophyses is: a) Rhizopus b) Mucor c) Absidia d) Curvularia C
Zygospores are sexual reproductive structures of: a) Penicillium spp b) Rhizomucor spp c) Alternaria spp d) Fusarium spp B
The cell walls of dematiaceous fungi contain the pigment: a) melanin b) carotene c) bilirubin d) urochrome A
Staib's medium (Niger seed agar) is useful in the ID of which of the following? a) Candida albicans b) Candida (Torulopsis) glabrata c) Saccharomyces cerevisiae d) Cryptococcus neoformans D
Penicillium can best be separated from Aspergillus by: a) color of the colonies b) optimum growth temp c) presence of rhizoids d) arrangement of the conidia on the conidiophore D
In processing clinical specimens & fungal isolates, lab workers may contract systemic funagl infections through: a) inhalation b) ingestion c) skin contact d) insect vector A
The microscopic structures most useful in the ID of dermatophytes are: a) septate & branching hyphae b) racquet & pectinate hyphae c) chlamydospores & microconidia d) macroconidia & microconidia D
All of the following are considered dermatophytes of the genera Deuteromycetes EXCEPT: a) Epidermophyton b) Microsporum c) Geotrichum d)Ttrichophyton C
The major features by which molds are routinely ID are: a) mode of sporulation, morphology, & arrangement of spores b) biochemical rxns & mycelial morphology c) mycelial morphology & selective media d) specialized sexual reproductive structures A
All of the following are genera of the Actinomycetes EXCEPT: a) Streptomycetes b) Nocardia c) Actinomycetes d) Deuteromycetes D
List the 5 major divisions of the fungi based on mycoses: Systemic, Subcutaenous, Yeasts, Superficial & dermatophytes & Opportunistic
Created by: nizhoni