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2011-04-08 12:50:31
Eukaryotic Cells Fungi

CH 7 Eukaryotic Cells: Fungi
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  1. Aseptate:
    - without a separating wall or membrane
  2. Chitin:
    - nitrogen-containing polysaccharide (a carbon) that is principal component of the exoskeletons of arthropods and bodies of fungi
  3. Hyphae: "web" Greek
    - One of the long slender tubes that develop from germinated spores and form the structural parts of the body of fungus

    - In many species of fungi, haphae are divided into sections by cross-walls called septa

    - a large mass of haphae is called mycelium

    - long chains of connected cells
  4. Mycelia:
    - mass of hyphae that forms the vegetative part of fungus

    - fuzzy masses of hyphae (mold)
  5. Saprobes:
    - obtain nutrients from dead organic material

    - majority of fungi are saprobes
  6. Septate:
    - divided by or having a septum
  7. Symbiotic:
    - obtain nutrients from living cells without harming them

    - close and usually obligatory association of 2 organisms of different species that live together with mutual benefit
  8. Parasitic:
    - obtain nutrients from living cells with harmful consequences to cells
  9. Difference between heterotroph and saprobe:
    • - heterotroph: use preformed (living or dead) organic material nutritionally
    • - all fungi are heterotroph

    - saprobes: fungi that require their nutrients come from dead organic material
  10. Important non-medical role of fungi:
    - break down organic material into forms that are reusable by other living things
  11. Buds:
    - round cells that grow on the side of the mother cell until they are ready to divide as new cells
  12. Describe appearance of:

    - Yeast
    - Molds
    - Mushrooms
    Yeast: have single, round cells

    Molds: Grow in long chains

    • Mushrooms: seen on dead or decaying organic material
    • (Slender stem and a rounded head w/spores on top of it.)
  13. How do septate and aseptate hyphae differ:
    - Septate - have cross-walls separating individual cells

    - Aseptate - lack cross-walls
  14. Main function of fungal spores:
    - spores allow widespread dissemination of the organisms (scatter or spread widely)
  15. Composition of fungal cell walls:
    - polysaccharide chitin
  16. What is the major lipid of fungi that is usually not present in prokaryotic or human cells:
    - Ergosterol

    (cholesterol is what humans and prokaryots have)