Biology Notes 1-28-08

Biology Notes 1-28-08 - -hyphae with partial septa no...

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Biology Notes January 28, 2008 Fungi: -heterotrophs -nonphotosynthetic -decomposers with external digestion -cell walls of chitin (same an insect exoskeleton) -filamentous cell with tip growth (hypha) -economically very important (fermentation, antibiotics) -zygotic life cycles, with varying degrees of specialization -fungi can penetrate the substrate Differences between groups: -Fungi vary in terms of their structure and reproduction. Zygomycota: -‘bread mold’ -simple construction, no cross walls -haploid cell that does not do cytokinesis so there are many nuclei in the growth tips -meiosis produces spores Ascomycota: -“sac fungi” or “cup fungi” -similar to zygomycota in +/- mating strains -cellular differences:
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Unformatted text preview: -hyphae with partial septa, no nuclei transfer between the septa-at the time of sexual reproduction 2 important features: 1) heterokaryon - A cell having two or more genetically different nuclei. 2) form a fruiting structure from heterokaryotic hyphae Biology Notes January 28, 2008 The zygote is formed in the asci (ascus), this is where meiosis occurs. Vocabulary: Asci - the sac in ascomycetes in which the sexual spores are formed. heterokaryon - A cell having two or more genetically different nuclei. Heterotrophs - An organism that cannot manufacture its own food and instead obtains its food and energy by taking in organic substances, usually plant or animal matter....
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This note was uploaded on 05/02/2008 for the course BIOL 102 taught by Professor Hill/smith during the Spring '08 term at Idaho State University.

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Biology Notes 1-28-08 - -hyphae with partial septa no...

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