Fungi: Introduction Flashcards
What are the 2 forms of fungi?
Yeast form
Mold form
Pathogenic yeasts reproduce by _________. Molds reproduce by _________.
budding
sporulation
When pathogenic yeasts reproduce, they form _______.
blastospores
Term for branched, elongated form of yeast.
pseudohyphae
_______ yeasts reproduce by sporulation.
fission
______ form of fungi are multicellular and filamentous while ______ form are mononucleated and single cellular.
mold
yeast
Molds have tubular, branching, multinucleated, filamentous structures called ______.
hyphae
Match the descriptor term of mold hyphae characteristics:
- cross walls present
- few or no cross walls
- intertwined hyphae masses
- septate
- aseptate
- mycelium
(T/F) Sporulation only occurs asexually.
False
(Asexual/sexual) sporulation occurs via nuclear fission.
sexual
A _______ is a fungus in a sexually reproductive/sporulation state.
telemorph
_______ is a fungus in a state of asexual reproduction/sporulation.
anamorph
(Anamorph/Telomorph) is in the majority of fungal lesions.
anamorph
What are the asexual spores called produced by hyphae?
conidia
Match the 3 types of Conidia with each description:
- asexual spores produced by segmentation of hyphae
- asexual spores produced by budding yeast
- large, thick-walled asexual spores formed by differentiation of hyphae
- arthrospores
- blastospores
- chlamydospores
(T/F) Fungi can be monomorphic or dimorphic, depending on how many forms they can grow into.
True
Dimorphic fungi can be either ________-dependent or ________-dependent.
temperature
nutrient
What kind of fungi invade hair and vegetative hyphae grow in the hair shaft?
dermatophytes
Dermatophyte diseased state where arthrospores form on the surface of the hair shaft.
ectothrix
Dermatophyte diseased state where arthrospores form on the inside of hair shaft.
endothrix
Dermatophyte diseased state where arthrospores form on both sides of the hair shaft.
ecto-endothrix
Term for dark brown or black fungi.
dematiaceous
Term for “spiny” walls of some conidia.
echinulate
Within the cell wall of fungi, ______ are D-glucose residues and ______ are N-acetyl glucosamine residues.
glucan
chitin
What fungal plasma membrane structure is a target for anti-fungal treatments?
ergosterol
(T/F) Subcutaneous fungal infections are a secondary infection from indirect contact with fungi.
False - caused by direct implantation
Term for subcutaneous granulomatous abscess which spreads to nearby tissues caused by fungal infection.
mycetoma
Term for a mycetoma with granules in pus.
maduromycosis
Systemic fungal infections are caused by spore ________.
inhalation
(T/F) Systemic fungal infection is contagious to nearby animals.
False
Term for intoxication that occurs from ingestion of fungal metabolites in food products.
mycotoxicosis
What base media is used to culture fungi for diagnosis?
sabouraud’s dextrose agar
What pH is Sabouraud’s Dextrose Agar? Why?
5.6
inhibits bacterial growth
What two CC mediums are used to inhibit nonpathogenic fungi and bacteria when culturing fungi for diagnosis?
cycloheximide
chloramphenicol
What serology test is most common in diagnosing fungal infections?
complement-fixation
