Bio lecture 3 - Lecture 3: Fungi o Believed to be sister...

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Lecture 3: Fungi o Believed to be sister group to animals because like animals they are Heterotrophs and contain plate like cristae in mitochondria and have flagellated cells that propel themselves with a single posterior flagellum. o Fungi form monophyletic group o Require moister to grow o They are decomposers that obtain nutrients from dead organic matter o All are eukaryotes. Cells contain membrane-enclosed nuclei, mitochondria, etc. o Like animals fungi are Heterotrophs; they depend on preformed carbon molecules produced by other organisms. However, unlike animals, fungi perform digestion outside the body, and after the food is broken down, the fungi absorbs the predigested food. o Fungi have cell walls composed of complex carbohydrates, including chitin: a polymer that consists of subunits of nitrogen-containing sugar. Chitin is resistant to breakdown by most microorganisms, also the component of the external skeletons of insects and arthropods. o DO NOT have plastids even though they may be green. o Two main types of fungi are yeasts and molds. o Yeasts Simplest fungi which are unicellular. Reproduce asexually Round/oval shape They are widely distributed in soil, leaves, fruits, and cured meats. Important in making bread and in medicine. Most fungi are molds: the vegetative body plan of molds consists of long, branched, threadlike filaments called hyphae. Hyphae are an adaptation to the fungal mode of nutrition. Also, growth occurs at the tips of the hyphae; as the hyphae elongate, the fungus grows into and infiltrates food sources. As hyphae grow, they form a tangled mass or tissue-like aggregation known as a mycelium. (cobweb-like). Usually, hyphae are divided by cross walls, called septa, into individual cells containing one or more nuclei. Some fungi, called coenocytic fungi, lack septa, and as a result, coenocytic fungus is on elongated, multinucleated, giant cell (worm-like). Most fungi reproduce by means of making spores, which are dispersed by wind.
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This note was uploaded on 04/06/2008 for the course BIOLOGY 102 taught by Professor Ta during the Spring '08 term at Rutgers.

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Bio lecture 3 - Lecture 3: Fungi o Believed to be sister...

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