Refers to early asexual life stages later the same

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Unformatted text preview: ductive stages Term mold refers to early asexual life stages Later the same fungus may reproduce sexually (ascocarp, basidiocarp etc.) Some molds have no known sexual stage deutermycetes (or imperfect fungi) Yeasts - unicellular fungi that inhabit liquid or moist habitats Some produce sexually by forming asci or basidia Most reproduce asexually by simple cell division or by pinching off small bud cells Saccharaomyces cerevisiae - ascomycete is most important of all domesticated fungi baker s yeast release small bubbles of CO2 brewer s yeast definitive host kinetoplastids are single large mitochondrion that contain multple copies of mitochondrial DNA Cultured anaerobically, ferments sugars to alcohol Some yeasts cause problems Pink yeast Rhodotorula grows on shower curtains and other moist surfaces Candida - inhabitant of moist epithelial tissue vaginal lining - yeast infections - example of opportunistic infection Lichens Often mistaken for mosses Symbiotic association of millions of photosynthetic microorganisms ( green algae or cyanobacteria) held in mesh of fungal hyphae Merger so complete - lichens actually given genus & species names Fungus gives lichen shape & structure Algae provides fungus with food Fungus provides suitable growth environment Some fungal compounds are toxic protect lichens from predators Lichens able to live where neither symbiont could live alone Mycorrhizae (fungus roots) Mutual association of plant roots & fungi Extensions of fungal mycelium greatly increase absorptive surface of roots Exchange of minerals accumulated from the soil by the fungus for organic nutrients synthesized by the plant Enormously important in natural ecosystems & agriculture Almost all vascular plants have mycorrhizae Fungi periodically form fruiting bodies Ascomycota, Basidiomycota & Zygomycota all have members that form mycorrhizae 1/2 of all species of mushroom-forming basidiomycetes live as mycorrhizae with oak, birch & pine trees Fungal-Animal Symbioses Fungi help break down plant material in t...
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