Wk 8 Lec 1

Wk 8 Lec 1 - Protists Protozoans Slimemolds Plants...

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What were we talking about? Protists Protozoans Slime molds Plants  Bryophytes Ferns Gymnosperms angiosperms
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Chapter 16 contd Fungi
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FUNGI Fungi absorb food after digesting it outside their bodies Fungi are heterotrophic  eukaryotes  that digest their food externally and absorb the  nutrients Like animals, must obtain organic molecules from other organisms Fungi are vital as mycorrhizal partners of plants and as decomposers Fungi are found virtually everywhere
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Fungal Structure Fungi usually consist of a mass of  threadlike  hyphae Branch repeatedly into a feeding structure  called a mycelium Are surrounded by a cell wall made of  chitin Grow at a phenomenal rate, extending  into new territory Develop a huge surface area for  digesting  food
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Fungal Reproduction Fungi produce spores in both  asexual  and  sexual  life cycles Many fungal species can reproduce sexually or asexually Many sexually reproducing fungi have a  heterokaryotic  phase Fusion of haploid hyphae produces cells containing nuclei from two  parents After varying lengths of time, parent nuclei fuse and form short-lived  diploid phase Haploid spores are produced by meiosis in specialized structure Asexually reproducing fungi Molds: fungi that reproduce by producing spores, often at the tips of  specialized hyphae Yeast: single-celled fungi that reproduce by cell division or budding
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Fungi and bacteria are the principal  decomposers of ecosystems. They keep ecosystems stocked with the  inorganic nutrients  necessary for plant  growth. Molds can destroy 
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This note was uploaded on 09/23/2011 for the course BIO 141 taught by Professor Brown during the Fall '08 term at Drexel.

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Wk 8 Lec 1 - Protists Protozoans Slimemolds Plants...

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