Q: Which equation best represents the rate of neurogenesis during peak proliferation in the ventricular zone?

$$\text{Rate} = \frac{\text{Number of new neurons}}{\text{Time}}$$

Question 1

During early embryonic development, which cell layer gives rise to the nervous system, and what structure does it initially form?

Accepted Answer

The ectoderm forms the neural tube.

Question 2

Which of the following best describes the process of neurogenesis in the developing nervous system?

Accepted Answer

Nonneural cells divide by mitosis in the ventricular zone, producing neurons and glial cells.

Question 3

A child is born with normal numbers of cortical neurons, but many are located in the wrong cortical layers. Which developmental stage is most likely responsible for this abnormality?

Accepted Answer

Cell migration

Question 4

Which molecule is released by the notochord to induce differentiation of motor neurons in the spinal cord?

Accepted Answer

Sonic hedgehog protein

Question 5

What is the primary function of cell adhesion molecules (CAMs) during neural development?

Accepted Answer

They guide migrating cells and growing axons by interacting with specific receptors on the growth cone membrane.

Question 6

Which of the following best explains the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic information of an individual, while phenotype is the observable physical characteristics.

Question 7

Which process is responsible for the net loss of synapses, grey matter volume, and cortical surface area in late childhood and adolescence?

Accepted Answer

Pruning of dendrites and axon terminals

Question 8

In the context of neural development, what is the role of neurotrophic factors such as NGF and BDNF?

Accepted Answer

They keep neurons alive and promote axon elongation and synapse formation.

Question 9

Which equation best represents the rate of neurogenesis during peak proliferation in the ventricular zone?

Accepted Answer

$$	ext{Rate} = \frac{	ext{Number of new neurons}}{	ext{Time}}$$

Question 10

Which of the following is TRUE regarding apoptosis in neural development?

Accepted Answer

Apoptosis is an active, programmed process involving caspases and death genes.

Question 11

A toddler experiences extreme sensory deprivation, resulting in reduced dendritic branching. Which concept best explains this outcome?

Accepted Answer

Sensitive period

Question 12

Which statement best describes the effect of monocular deprivation during the critical period of visual cortex development?

Accepted Answer

The deprived eye will not respond in adulthood.

Question 13

Which of the following is a real-world example of phenotypic plasticity?

Accepted Answer

A rabbit changes its fur color depending on the season.

Question 14

Which process allows neurons to compete for survival during development, and what is the outcome for neurons that do not receive enough neurotrophic factors?

Accepted Answer

Apoptosis; neurons that do not receive enough factors undergo programmed cell death.

Question 15

Which equation best describes the relationship between synaptic strength and activity according to Hebbian theory?

Accepted Answer

$$\Delta w = \eta \cdot x \cdot y$$

Question 16

Which of the following is a major cellular feature of Alzheimer's disease?

Accepted Answer

Formation of senile plaques by β-amyloid buildup

Question 17

Which brain region is most intensely myelinated during adolescence, and what cognitive abilities does it support?

Accepted Answer

Prefrontal cortex; working memory, planning, and impulse control

Question 18

Which of the following best describes the effect of an enriched environment on the brain?

Accepted Answer

It increases dendritic complexity, cortical thickness, and synaptic number.

Question 19

Which equation would you use to calculate the proportion of neurons surviving after apoptosis, given the initial and final neuron counts?

Accepted Answer

$$	ext{Proportion surviving} = \frac{	ext{Final neuron count}}{	ext{Initial neuron count}}$$

Life-Span Development of the Brain and Behavior: Neural Development and Plasticity

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