BSC 2005 Lecture Notes - Lecture 12: Mycelium, Phloem, Xylem

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Eukaryote diversity, includes plants, animals, fungi, and unicellular protists, all have membrane bound nucleus and organelles. Where did eukaryotes come from: endosymbiant theory suggests that prokaryotes ingested other prokaryotes, which survived and became mitochondria and chloroplasts. Evidence for endosymbiant theory: chloroplasts and mitochondria, are about the size of prokaryotic cells, divide similarly to prokaryotes, have their own dna and ribosomes, and is circular like prokaryotes, have dna sequences similar to prokaryotes. Mostly (unicellular protists: unicellular eukaryotes, very diverse: often important parts of food chains, all susceptible to desiccation-drying out: typically need moist environment such as water, soil or living hosts. Fungi: includes mold, mushrooms, and yeasts, critical role as decomposers. Fungi structure: unicellular or multicellular, cell walls made of chitin, heterotrophs. Secrete digestive enzymes onto food and then absorb nutrients: some have hyphae (threads or strands) to absorb nutrients. Fungi diversity: yeast, mold, athlete s foot, mushrooms, ringworm.

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