Question 1

Which of the following best describes the direction and function of kinesin motor proteins in axonal transport?

Accepted Answer

Kinesins move anterogradely, transporting vesicles and organelles from the soma to the axon terminal.

Question 2

Which process is responsible for the movement of cytoplasmic proteins and cytoskeleton proteins at a rate of up to 8 mm/day in neurons?

Accepted Answer

Slow axonal transport

Question 3

What is the primary energy source that drives the movement of motor proteins along microtubules in axonal transport?

Accepted Answer

ATP hydrolysis

Question 4

A mutation impairs dynein function in a neuron. Which of the following is the most likely consequence?

Accepted Answer

Impaired retrograde transport of old organelles to the soma

Question 5

Which of the following best explains why proteins must be synthesized in the soma and not in the axon?

Accepted Answer

The axon lacks ribosomes and endoplasmic reticulum necessary for protein synthesis.

Question 6

Which of the following statements about synaptic plasticity is correct?

Accepted Answer

Synapses must be maintained through repeated use, or they may be lost.

Question 7

Which of the following is a key difference between chemical and electrical synapses?

Accepted Answer

Electrical synapses are faster because they allow direct passage of ions through gap junctions.

Question 8

A neuron is exposed to a toxin that blocks ATP synthesis. Which process would be most directly affected?

Accepted Answer

Active transport of vesicles by kinesins and dyneins

Question 9

Which of the following best describes the role of the Golgi apparatus in neuronal protein transport?

Accepted Answer

It packages proteins into vesicles for transport along the axon.

Question 10

Which of the following equations best represents the rate of fast anterograde axonal transport?

Accepted Answer

$$v = 400 \, 	ext{mm/day}$$

Question 11

Which of the following scenarios best illustrates the concept of 'use it or lose it' in synaptic maintenance?

Accepted Answer

A child exposed to a variety of sensory experiences forms more stable synapses.

Question 12

Which of the following is TRUE regarding the movement of kinesins and dyneins along microtubules?

Accepted Answer

Kinesins move toward the positive end (anterograde), and dyneins move toward the negative end (retrograde).

Question 13

Which of the following best explains why fast axonal transport is necessary in neurons?

Accepted Answer

Neurons lack the ability to synthesize proteins in the axon, requiring rapid transport from the soma.

Question 14

Which of the following is a plausible mechanism for how kinesins return to the soma after anterograde transport?

Accepted Answer

Kinesins hitch a ride on dynein during retrograde transport.

Question 15

Which of the following best describes the process of synaptic vesicle recycling?

Accepted Answer

Vesicle membranes are retrieved and reused after exocytosis.

Axonal Transport and Synaptic Physiology: Study Notes for ANP College Students

Study Guide - Practice Questions