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A vertebrate born with damage to the rhombencephalon is also likely to have
damage to the
a. metencephalon.
b. mesencephalon.
c. telencephalon.
d. diencephalon. - ANSWER A
Trauma that affects the central nervous system of a human embryo between 22 and
24 days after fertilization would not affect
a. neural crest formation.
b. brain formation.
c. neurogenesis in the forebrain.
d. Both b and c - ANSWER A
In neurons undergoing apoptosis, DNA is cut up by a. caspases.
b. IAPs.
c. Diablo.
d. death genes. - ANSWER A
Certain growing axons are prevented from crossing the midline by the _______
action of the protein _______.
a. chemoattractant; Semaphorin b. chemorepellent; Semaphorin c. chemoattractant;
Slit
d. chemorepellent; Slit - ANSWER D
The release of Diablo within neurons is induced by an influx of _______ ions. a. Na+
b. Cl-
c. Ca2+
d. K+ - ANSWER C
Which of the following is not a feature of C. elegans? a. Extensive cell-cell
interactions
b. Transparent bodies
c. Small number of neurons
d. Mitotic determination of cell fate - ANSWER A
During a period of normal cell death, developing neurons are thought to compete for
a. cell adhesion molecules.
b. death genes.
c. neurotrophic factors.
d. glucose. - ANSWER C
Experiments involving tissue in a dish are called _______ studies. a. in vivo
, b. in vitro
c. in situ
d. indeterminate - ANSWER B
The pattern of regeneration of the frog visual system supports the _______
hypothesis proposed by Sperry.
a. brain plasticity
b. chemoaffinity
c. apoptosis
d. synapse elimination - ANSWER B
Which of the following plays little role in the development of the nervous system of C.
elegans, given that cell fate is closely regulated by the mitotic lineage in this
species? a. Cell-cell interaction
b. Induction
c. Regulation
d. All of the above - ANSWER D
Lead poisoning in an infant, which destroys newly forming myelin, would mostly
affect the
a. forebrain.
b. cranial nerves.
c. hindbrain.
d. spinal cord. - ANSWER A
In a frog, the segregation of inputs from two eyes that are forced to innervate a
single optic tectum requires
a. visual stimulation.
b. induction.
c. apoptosis.
d. degeneration. - ANSWER A
When a neuron dies, a surviving neuron that once received inputs from that cell
loses some of its dendrites by a process called
a. Wallerian degeneration.
b. transneuronal degeneration.
c. retrograde degeneration.
d. sprouting. - ANSWER B
The major factor that determines how many motoneurons will die during normal
development is
a. target size.
b. exercise.
c. cell adhesion molecules.
d. death genes. - ANSWER A
Most of the mitosis that will give rise to the nervous system takes place in the a.
ventricular layer.
b. forebrain.
c. intermediate layer.