Card Set Information
for Midterm 1
When/where were the first written records of nematodes? What type of nematode?
5000 years ago; China ; Ascaris
What is the vinegar eelworm? When was it first described?
Turbatrix aceti; 1650
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
_________ was used to study fertilization?
______________ was used to study embryology by Boveri in 1893
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
__________ term for transverse lines or grooves of the cuticle of nematodes (most easily observed with a scanning electron microscope)
Give the genus and species name of the nematode model organism that is the most thoroughly studied nematode in the world.
When observing a nematode in cross section, you would see how many epidermal (hypodermal) cords?
Give the century (or year, if you like) when plant parasitic nematodes were first observed by use of the microscope.
Term for part of the somatic muscle cell that links it to the nerve cord.
Specific term for shedding of the “old” cuticle during molting.
Starting with a fertilized egg, how many molts do nematodes undergo to complete their development?
Orientation (direction) of body wall (somatic) muscle cells of nematodes.
Nematodes are members of this phylum
NEMATODA OR NEMATA
Of the three main layers/zones of cuticle, the one that is closest to the external environment.
Of the three main layers/zones of cuticle, the one that is in the middle
Of the three main layers/zones of cuticle, the one that is innermost
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].
Main type of proteins that make up the cuticle
In which sex might you find a copulatory bursa?
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).
Of the three main layers of cuticle, the one that gives it the most strength.
This tissue is responsible for producing sex pheromones in certain nematodes.
EPIDERMIS OR HYPODERMIS
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.
Name for the type of glial cell that provides a tight junction to the nematode cuticle
(True or False). Caenorhabiditis elegans was the first nematode to be used as a model organism to study fundamental biological processes.
Thermoreceptors have been found to be located within this specific type of nematode sensillum
Of the total number of estimated nematodes species, what percentage are thought to be plant parasites.
10%, ACCEPTED 5-15%
How many molts does a nematode undergo when developing from an L3 (or juvenile stage 3) to the adult stage?
Nematodes have 2 or more of this type of esophageal gland. [blank].
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.
True or False. All nematode papillae are mechanoreceptors
Name of the first USDA nematologist who wanted to popularize nematodes.
[NATHAN AUGUSTUS COBB
Name of the hormone that binds to EcR in insects to initiate the molting cascade.
If a nematode has a single excretory pore, it belongs to which class?
CHROMADOREA OR SECERNENTEA
What is the name of the fancy/elaborate cuticle modifications observed in the lip regions of some microbivores, particularly cephalobs?