Q: Which ion is the axonal membrane of a neuron impermeable to at resting membrane potential?  

Answer: B

At resting membrane potential, the axonal membrane of a neuron is nearly impermeable to sodium ions. However, the membrane is permeable to potassium ions. The resting membrane potential is the electrical potential difference between the inner and outer surfaces of the axonal membrane when the neuron is not transmitting any signals. This potential difference is maintained by the selective permeability of the axonal membrane to different ions, which is controlled by ion channels and ion pumps. The resting membrane potential is important for the normal functioning of neurons, and any disturbance in this potential can lead to neuronal disorders.

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