Nematology MT1

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Anonymous
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133700
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Nematology MT1
Updated:
2012-02-08 05:17:35
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nematology nematodes
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for Midterm 1
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  1. When/where were the first written records of nematodes? What type of nematode?
    5000 years ago; China ; Ascaris
  2. What is the vinegar eelworm? When was it first described?
    Turbatrix aceti; 1650
  3. Needham observed "bunted wheat fibers" that came to life when water was added. When did this happen and what species of nematode?
    1743; Anguina tritici
  4. _________ was used to study fertilization?
    Ascaris
  5. ______________ was used to study embryology by Boveri in 1893
    Parascaris
  6. What is the organism most commonly used as a model organism? Why was it used?
    Caenorhabditis elegans; very transparent, free-living, can self-fertilize and produce males
  7. __________ term for transverse lines or grooves of the cuticle of nematodes (most easily observed with a scanning electron microscope)
    Annulations
  8. Give the genus and species name of the nematode model organism that is the most thoroughly studied nematode in the world.
    Caenorhabditis elegans
  9. When observing a nematode in cross section, you would see how many epidermal (hypodermal) cords?
    FOUR
  10. Give the century (or year, if you like) when plant parasitic nematodes were first observed by use of the microscope.
    18THCENTURY, 1743
  11. Term for part of the somatic muscle cell that links it to the nerve cord.
    [INNERVATION PROCESS
  12. Specific term for shedding of the “old” cuticle during molting.
    ECDYSIS
  13. Starting with a fertilized egg, how many molts do nematodes undergo to complete their development?
    FOUR
  14. Orientation (direction) of body wall (somatic) muscle cells of nematodes.
    LONGITUDINAL
  15. Nematodes are members of this phylum
    NEMATODA OR NEMATA
  16. Of the three main layers/zones of cuticle, the one that is closest to the external environment.
    CORTEX
  17. Of the three main layers/zones of cuticle, the one that is in the middle
    Medial
  18. Of the three main layers/zones of cuticle, the one that is innermost
    Basal
  19. If you found an adult nematode in the soil that had a stoma with large teeth, it is most likely that this nematode belongs to the trophic group known as [blank].
    PREDATOR
  20. Main type of proteins that make up the cuticle
    COLLAGENS/KERATIN
  21. In which sex might you find a copulatory bursa?
    MALE
  22. Approximately this many species of nematodes have been formally (scientifically) described (choose from: 10,000, 24,000, 42,000, 150,000 or 1,000,000).
    24,000
  23. Of the three main layers of cuticle, the one that gives it the most strength.
    BASAL ZONE
  24. This tissue is responsible for producing sex pheromones in certain nematodes.
    EPIDERMIS OR HYPODERMIS
  25. All plant-parasitic nematodes have this structural feature of their stoma (general name) that is used to penetrate plants and feed on plant cell contents.
    STYLET
  26. Name for the type of glial cell that provides a tight junction to the nematode cuticle
    SOCKET CELL
  27. (True or False). Caenorhabiditis elegans was the first nematode to be used as a model organism to study fundamental biological processes.
    False
  28. Thermoreceptors have been found to be located within this specific type of nematode sensillum
    AMPHIDS
  29. Of the total number of estimated nematodes species, what percentage are thought to be plant parasites.
    10%, ACCEPTED 5-15%
  30. How many molts does a nematode undergo when developing from an L3 (or juvenile stage 3) to the adult stage?
    2
  31. Nematodes have 2 or more of this type of esophageal gland. [blank].
    Subventral
  32. This structure, when present, lines the dorsal side of the cloaca and serves to guide the spicules and protect the body from damage by the spicules.
    GUBERNACULUM
  33. True or False. All nematode papillae are mechanoreceptors
    FALSE
  34. Name of the first USDA nematologist who wanted to popularize nematodes.
    [NATHAN AUGUSTUS COBB
  35. Name of the hormone that binds to EcR in insects to initiate the molting cascade.
    20-HYDROXYECDYSONE
  36. If a nematode has a single excretory pore, it belongs to which class?
    CHROMADOREA OR SECERNENTEA
  37. What is the name of the fancy/elaborate cuticle modifications observed in the lip regions of some microbivores, particularly cephalobs?
    PROBOLAE

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