Biology - Lecture 10

Biology - Lecture 10 - Lecture10NotesFungi...

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Lecture 10 Notes – Fungi 04:52 Biggest organism in the world? 100’s of tons, 2200 acres, 2000+ years old! What are Fungi? Eukaryotes Cell walls of chitin Closely related to animals o 1 billion years ago – flagellated single cell ancestor o humans and fungi are close in the phylogeny tree Absorptive heterotrophs o Secrete exoenzymes to digest food and then ingest o Food obtained from varitey of sources Plants – photosynthesis (photoautotrophs) Fungi – Absorption (heterotrophs) Life style o Decomposers (saprobes) o Animal parasites 80% of plant parasites o Mutualistic symbionts o Fungi have a cell wall, but made of chitin
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Absorptive heterotrophs Exhibit many  Form and Function Single Cell o Yeasts Reproduce via asexual budding Multicellular o Hyphae – filamentous cell Septate – hyphae separate into branches Pores allow ribosomes, mitochondria and nuclei to pass Coenocytic – one long filament  o Mycelium – hyphae mass Majority underground
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Biology - Lecture 10 - Lecture10NotesFungi...

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