Body Plans and Nutritional Modes

Body Plans and Nutritional Modes - are parasites . All...

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Body Plans and Nutritional Modes Fungi contain unicellular, multinucleate, and multicellular forms.They are classified on the basis of their reproductive spores and the nature of their multinucleate or multicellular filaments known as hyphae . The structure of Penicillium is shown in Figure 2. Fungal cells have cell walls containing the carbohydrate chitin . Chitin also occurs in the exoskeletons of the animal phylum arthropoda. Fungi are absorptive heterotrophs: they break down food by secreting digestive enzymes onto a substrate and then absorb the resulting small food molecules . Fungal hyphae have a small volume but large surface area, enhancing the fungal absorptive capacity. Excess sugar is stored as the polysaccharide glycogen . This is also the storage product for sugars in animals. Fungal hyphae are collectively termed a mycelium . Some fungi are saprophytes , they obtain their food from the decaying bodies of plants and animals. Other fungi
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Unformatted text preview: are parasites . All fungi, except the chytrids, lack flagella. Fungal reproduction thus mandates that the nonmotile gametes be brought together by the meeting of opposite strains of hyphae. Fungi are important both as a source of food and in the preparation of food. Edible fungi include mushrooms, truffles, and morels. Cheeses such as Gorgonzola, Roquefort, Stilton, and bleu have fungal colonies that give theses cheeses their distinctive flavors. Beer and wine are produced through the action of fungi known as yeasts, such as Saccharomyces cerevisae . Many antibiotics, such as penicillin, are also produced by fungi. Fungi also are important crop parasites, causing loss of food plants, spoilage of food and some infectious diseases. The 1972 U.S. corn crop was almost completely eradicated by a fungus. Fungal parasites annually cause many billions of dollars in crop damage and food spoilage....
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Body Plans and Nutritional Modes - are parasites . All...

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