An Axonal Growth Cone Has Reached a Muscle Fiber and Is

question 53

Multiple Choice

An axonal growth cone has reached a muscle fiber and is forming a neuromuscular junction. Which of the following events does NOT normally occur in this process?

• A) Agrin secreted from the growth cone serves as a signaling molecule affecting the muscle cell.
• B) LRP4 on the surface of the growth cone serves as a signaling molecule affecting the muscle cell.
• C) Synaptic vesicles containing the neurotransmitter acetylcholine appear in the growth cone.
• D) Acetylcholine receptors cluster on the muscle cell plasma membrane at the junction.
• E) A thin layer of basal lamina forms at the cleft between the two cell membranes at the junction.

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