molds - or sexual; many species can produce both types....

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Kristen Walsh Core Science December 6, 2009 Extra credit Topic of your choice: Mold Mold include all species of microscopic fungi that grow in the form of multicellular filaments, called hyphae. In contrast, microscopic fungi that grow as single cells are called yeasts. A connected network of these tubular branching hyphae has multiple, genetically identical nuclei and is considered a single organism, referred to as a colony or in more technical terms a mycelium. Molds do not form a specific taxonomic or phylogenetic grouping, but can be found in the divisions Zygomycota, Deuteromycota and Ascomycota. Although some molds cause disease or food spoilage, others are useful for their role in biodegradation or in the production of various foods, beverages, antibiotics, and enzymes. There are thousands of know species of molds which include opportunistic pathogens, saprotophs, aquatic species, and thermophiles. Molds reproduce through small spores, which may contain a single nucleus or be multinucleate. Mold spores can be asexual
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Unformatted text preview: or sexual; many species can produce both types. Some can remain airborne indefinitely, and many are able to survive extremes of temperature and pressure. Although molds grow on dead organic matter everywhere in nature, their presence is only visible to the unaided eye when mold colonies grow. A mold colony does not comprise discrete organisms, but an interconnected network hyphae called a mycelium. Many molds can begin growing at 4 degrees Celsius, the temperature within a typical refrigerator, or less. When conditions do not enable growth, molds may remain alive in a dormant state depending on the species, within a large range of temperatures before they die. The many different mold species vary enormously in their tolerance to temperature and humidity extremes. Certain molds can survive harsh conditions such as the snow-covered soils of Antarctica, refrigeration, highly acidic solvents, and even petroleum products such as jet fuel....
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This note was uploaded on 05/06/2010 for the course PLS 100 taught by Professor Newcity during the Spring '08 term at Roger Williams.

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molds - or sexual; many species can produce both types....

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