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Return to Behavioral Neurobiology 3e student resources
Chapter 4 Self-test questions
Orienting movements
Quiz Content
*
not completed
.
Which of the following behaviors is called 'positive phonotaxis'?
Orienting movement of a freely moving animal toward a light stimulus.
correct
incorrect
Orientation of a sessile animal toward a light stimulus.
correct
incorrect
Orienting movement of a freely moving animal toward an acoustic stimulus.
correct
incorrect
Orienting movement of a freely moving animal away from an acoustic stimulus.
correct
incorrect
*
not completed
.
Which of the following statements concerning cilia is
not
correct?
Cilia are found in unicellular protists but are absent from metazoans.
correct
incorrect
Cilia are hair-like appendages, with a bundle of microtubules at their core.
correct
incorrect
The locomotion behavior of
Paramecium
is mediated by cilia.
correct
incorrect
Whereas cilia can be observed under the light microscope, an electron microscope is needed to view microtubules.
correct
incorrect
*
not completed
.
Which of the following statements regarding the response of
Paramecium
to mechanical stimulation are correct? Please select all that apply.
Mechanical stimulation of the anterior end of
Paramecium
causes a reversal of the normal beat orientation of the cilia, resulting in a backward locomotion of the cell.
correct
incorrect
Mechanical stimulation of the anterior portion of the cell membrane of
Paramecium
leads to the activation of mechanosensitive calcium channels.
correct
incorrect
Activation of mechanosensitive calcium channels at the anterior end of
Paramecium
leads to an influx of Ca
2+
ions into the cell, and thus to a depolarizing receptor potential.
correct
incorrect
Activation of mechanosensitive potassium channels, at the posterior end of
Paramecium
, leads to an influx of K
+
ions into the cell, and thus, to a depolarizing receptor potential.
correct
incorrect
*
not completed
.
Galvanotaxis in
Paramecium
involves an orienting movement towards the cathode of a DC electric field.
True
correct
incorrect
False
correct
incorrect
*
not completed
.
Which of the following statements concerning galvanotaxis in
Paramecium
is correct?
Galvanotaxis is a behavioral response frequently exhibited by
Paramecium
under natural conditions.
correct
incorrect
Galvanotaxis in
Paramecium
is mediated by beating of the cilia in specific directions determined by the local membrane potential.
correct
incorrect
Galvanotaxis in
Paramecium
is mediated by beating, toward the posterior pole, of all cilia on the cell's membrane.
correct
incorrect
Exposure of
Paramecium
to a DC electric field triggers a strong depolarizing receptor potential, thus enhancing the beat rate of the cilia over the entire cell surface.
correct
incorrect
*
not completed
.
Which of the following statements about the otolith organ of the inner ear of vertebrates are correct? Please select all that apply.
Geotaxis in vertebrates is mediated by the otolith organ of the inner ear.
correct
incorrect
In the otolith organ, bending of the stereocilia toward the row of the tallest stereocilia results in depolarization of the hair cells.
correct
incorrect
Hyperpolarization of the hair cells in the otolith organ results in a decrease of the firing rate in the afferent fibers of the vestibular nerve.
correct
incorrect
The function of the otolith organ depends on the pressure exerted by the otolith on the hair cells of the macula.
correct
incorrect
*
not completed
.
The stereocilia of hair cells are, as the name implies, true cilia.
True
correct
incorrect
False
correct
incorrect
*
not completed
.
Which of the following statements characterizes the composition of the hair-like projections at the apical surface of hair cells, in the vestibular system of vertebrates?
One stereocilium and a few dozen kinocilia.
correct
incorrect
A random mix of flagella, stereocilia, and kinocilia.
correct
incorrect
One kinocilium and a few dozen stereocilia.
correct
incorrect
Equal numbers of kinocilia and stereocilia.
correct
incorrect
*
not completed
.
Finish this sentence correctly: In hair cells of the inner ear of vertebrates, transduction of the bending of the stereocilia into an electrical response is mediated by:
G-protein-coupled receptors.
correct
incorrect
mechanically sensitive channels.
correct
incorrect
cyclic nucleotide-gated channels.
correct
incorrect
sensory transient receptor potential family of cation channels.
correct
incorrect
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