molds and yeasts
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Created by:
rjleonard92 on July 22, 2011
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10 terms
Terms | Definitions |
|---|---|
 what are the five distinguishing characteristics of fungi? | eukaryotic, heterotrophic, lack tissue differentiation, cell walls of chitin or other polysaccharides, propagate by spores |
| describe how modern fungal classification schemes differ from more traditional ones. why are we using traditional methods to characterize fungi in this lab exercise? | modern schemes of classification use genetic analysis to determine relatedness between species while traditional schemes rely on morphological characteristics and reproducive mechanisms to determine relatedness. traditional methods are used in this exercise because examination of morphological characteristics is easily accomplished in the lab |
| name important phenotypic characteristics used in the identification of fungi | colony appearance, types of hyphae, sexual spores and asexual spores |
| differentiate between molds and yeasts. what term is given to fungal species that have both a mold and yeast phase? | molds are filamentous fungi that produce hyphae while yeasts are fungi that lack hyphae. yeasts may form reproductive buds called pseudohyphae. fungal species that occur as either molds or yeasts are known as dimorphic |
| differentiate between hyphae and mycelia | hyphae are microscopic filaments produced by molds and a macroscopic mass of hyphae is called mycelium |
| what characteristic determines that funal hyphae are coenocytic? | fungal hyphae are coenocytic if they are unbroken by crosswalls or septa. these fungi are also termed nonseptate |
| what are types of asexual spores of fungi? | asexual spores of fungi include sporangiospores as well as several types of conidia, such as phialospores, blastospores, arthrospores and chlamydospores |
| what are the types of sexual spores of fungi? | sexual spores of fungi include zygospores, ascospores and basidiospores |
| describe how sporangiospores differ from conidia | sporangiospores are sexual spores produced within a thin-walled sac called a sporangium. sporangiospores may or may not be motile. conidia are asexual non-motile spores that form on specialized hyphae called conidiophores |
| compare the morphological characteristics of bacteria and fungi | macroscopically, bacterial colonies are smoother and shinier than fungal colonies, which generally appear dry and cottony. microscopically, fungal cells are far larger than bacteria, with a visible nucleus and vacuoles. morphologically, molds may display hyphae, sporangia, and spores while yeast may show budding and pseudohyphae. bacterial cells appear more uniform, with no specialized structures |
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