Eating habits - 5th set Flashcards
fungi
They are heterotrophs and saprophytes; some are parasites Cell wall made of chitin (target for antifungal agents) is present.
Fungi prefers to grow..
in acidic pH ( 5 or lower ) with high salt and sugar in slight moist environment and relative humidity of 70 % or more
fungi have a filamentous…
body (mycelium); individual filament is called hypha (plural - hyphae)
The hyphae are well adapted to..(eating - sick - kitchen table)
absorb food –high surface to volume ratio –releases enzymes to breakdown food; also acts as a repellant
Vegetative hyphae
segment of hyphae which obtains nutrition
Aerial hyphae
projects above the surface; bears reproductive spores
Specialized hyphae includes
haustoria and rhizoids
Dimorphic fungi can grow as…
yeast like ( unicellular ) or as mycelia
2 classes of hyphae
depending on the presence of septa ( cross wall ) In some, individual cells are separated from one another by septa (septate hyphae vs coenocytic hyphae )
All fungi have lysosomes
-digest damaged cells -helps parasitic fungi to invade host
Fungi have unusual reproductive modes
Sexual as well as Asexual produces spores. Asexual or sexual spores germinates, develop into new hyphae and mycelium
antifungal drugs target
Affects / targets membrane component
Azoles
includes Clotrimazole, Miconazole, Fluconazole FYI -inhibits ergosterol synthesis ; interfere in the synthetic pathway-active component of medications (over the counter) to treat localized, superficial yeast infection
Antifungals that target cell division (grease - couch)
Gresiofulvin (synthesized by some fungi)-exact mechanism, unknown-thought to interfere with spindle fibers component microtubules during polymerization/depolarmerization; blocks mitotic events used for nail and skin fungal infection treatment.
Antifungal - Nucleic acid synthesis (kitchen counter - cite-o-sine)
poor target. Flucytosine: taken by yeast cell’s permease and converted into active, inhibitory form, 5 fluorouracil ( inhibits nucleic acid synthesis )
hetro means…
different carbon and energy sources.
facultative anaerobes (flex) and ex.
flexible in their oxygen requirement. ex. - yeast (candida)
sabarouds fungi medium
high salt and sugar, and acid ph unique.
hyphae…(1)
1 filament from hairlike fungi body
hyphae are…(noe)
one hyphae close by will release repellants will signal other hyphae to move to different area for nutrients.
part of hyphae on top of and under bread..
bread, called arial hyphae. usually has reproductive cells. part under, in bread - called vegetative hyphae
parasitic
grows on sikin called haustoria, they are gentle in their actions. others are rhizoids, feeds off dead organic matter, much more aggressive.
fungi are…(missed question)
natural decomposers, act upon dead organic matter and recycle most elements to the atmosphere or environ.