The voltage-gated calcium channel is a protein that is imbedded and spans the lipid membrane to allow the movement of calcium into the axon terminal. What is the appropriate amino acid configuration of this channel that allows this movement to happen? Select one: O a. non-polar amino acids on the interior surface and polar on the exterior surface b. polar amino acids on the interior surface and polar on the exterior surface c. non-polar amino acids on the exterior surface and polar on the interior surface O d. non-polar amino acids on the interior surface and non-polar on the exterior surface
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