Ch 31 - Fungi (1 slide per page)-1

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Unformatted text preview: 00 cm2 surface area http://www.shutterstock.com/pic-34273630/stock-photo-mold-strawberry.html Figure 31.2 (Campbell et al.) 9 Fruiting Bodies are variable among groups Zygomycota Ascomycota sporangiophore conidiophore Ascomycota Basidiomycota Ascocarp w/ Asci Asci w/ ascospores 10 Morphology of Multicellular fungi • Cell walls = mostly chitin • Chitin is a nitrogen containing polysaccharide derived from glucose • Very strong for support • Found where else? http://www.flickr.com/photos/ajc1/3420421465/ Figure 31.3 (Campbell et al.) 11 Morphology of Multicellular fungi • Septate spp - hyphae divided into cells by septa • Aseptate spp - cells are undivided Septate hyphae Aseptate hyphae Figure 31.3 (Campbell et al.) 12 Morphology of Multicellular fungi In septate hypha, pores in septa may allow flow of: • cytoplasm, • mitochondria • ribosomes • even nuclei! Are fungi really multicellular??? http://www.bsu.edu/classes/ruch/msa/blackwell/9-33.jpg Pore closure separating cells allows cells to perform different functions e.g. develop into a reproductive structure http://www.fungionline.org.uk/3hyphae/1hypha_ultra.html Nutrition 13 All fungi are absorptive heterotrophs • NO chlorophyll • NO fixing of carbon from CO2 • Enzymes digest food outside body 3 ways which fungi obtain nourishment: 1. Saprobic • from nonliving or decaying organic matter 2. Parasitic • from living hosts in or on which they live 3. Predatory • by capturing live animals 14 Nutrition Most secrete hydrolytic enzymes that break down organic macromolecules (living and dead) to absorbable compounds Absorb digested compounds Nutrition 15 Some extract absorbable nutrients directl...
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