lecture 3

lecture 3 - Lecture 3 Ch 25 Fungi monophyletic sister group...

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Unformatted text preview: Lecture 3 Ch. 25 Fungi- monophyletic, sister group to animals, heterotrophic, eukaryotes, no plastids. Most fungi are molds Eukaryotes- cells contain membrane enclosed nuclei, mitochondria and other membranous organelles. Heterotrophs- cannot produce own organic material from a simple carbon source. Instead obtain preformed carbon molecules produced by other organisms. Do not ingest food- secrete digestive enzymes onto food source and absorb predigested food through their cell walls and plasma membranes Most decomposers- get nutrients from dead organic matter Require moisture to grow (moist habitats) Contains no plastids- no photosynthetic organelles Cell wall consists of complex carbohydrates including chitin (polymer that consists of subunits of nitrogen-containing sugar) Component of external skeleton, known as chitin (see last lecture)-[polymer that consists of subunits of nitrogen] of insects and arthropods—resistant to breakdown by most microorganisms Hundreds of fungal species are unicellular—round or oval shaped bodies Yeast – (unicellular) found in dirt, leaves, fruits, cured meats, on our bodies. Reproduction of Fungi Most fungi reproduce by means of Microscopic spores (non-mobile reproductive cells dispersed by wind, water, or animals) usually produced- aerial hyphae or fruiting structures. permits spores to be easily dispersed. Spores are produced in Fruiting Bodies. They contain a haploid nucleus- not normal Cycle of reproduction 1. the hyphae of two genetically equal mating types come together (cytoplasm and nuclei fuse= diploid cell, zygote a. three types of structures- i. gametangia- where gametes are formed ii. sportangia- structures in which spores are produced iii. conidiophores- specialized hypha that produce asexual spores called conidia. Two Fungal Groups- 1. Ascomycetes and 2. Basidiomycetes In these two, the hyphae fuse but the two different nuclei do not fuse immediately, rather they remain separate within the fungal cutoplasm....
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This note was uploaded on 04/04/2008 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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lecture 3 - Lecture 3 Ch 25 Fungi monophyletic sister group...

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