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2013-09-16 22:43:42
Biology GRE

Biology GRE
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  1. Fungi
    • Eukartoytic multicellular
    • Lack photosynthesis
    • Get nutrients and water from absorption
    • Classified based on differences in reproductive structure
  2. Saprobes
    Absorbs nutrients from non living
  3. Parasitic
    Absorbs nutrients from living host
  4. Hyphae
    • long strand of cells that are attached end to end
    • May make large networks
  5. Mycelium
    Fungal mat
  6. Zygoycetes
    Reproduction occurs with male and female structure both on separate hyphae
  7. Plasmagamy
    Cytoplasm of male and female fuse
  8. Gametangia
    • Reproductive parts hyphae contain several haploid nuclei
    • Cytoplasm of male ad female fuse, followed by fusion of haploid nuclei
    • Ex: mycorrhizae
  9. Karyogamy
    • Fusion of haploid nuclei
    • Only happens when conditions are favorable
  10. Ascomycetes
    • Also known as sac fungi
    • Female gametangia receive haploid nuclei from male, female start to grown rapidly into hyphea adn make asci
  11. Asci
    closed compartments where karyogamy takes place
  12. Ascosphores
    Asci that divide by mitosis
  13. Basidiomycetes
    • Mushrooms
    • Basiocarps- Large umbrella shape reproductive bodies
    • Asexual spores under basicocarps¬†
    • Hypae stretched undergrond
    • Haploid hyphae meet spores released from mushroom
  14. Dikaryotic Hyphae
    Having nuclei from two parents, grow into new hyphea
  15. Molds
    Are rapid growing fungi that reproduce only asexually
  16. Yeasts
    • Are unicellular fungi that inhibit moist environments
    • Reproduce vis budding
  17. Lichens
    • Combination of fungus and algae living together in one organism
    • Algal cells make sugar and nutrients for themselves while the fungus absorbs water and house algae
    • First colonizers of landscapes after fire and extremely hardy but sensitive to man made pollution
    • Reproductive sexually and asexually using spires and alternation of generations