What Are the Similarities Between Sodium, Potassium, and Calcium Ion

question 40

Multiple Choice

What are the similarities between sodium, potassium, and calcium ion channels?

• A) All allow passage of multiple different ions.
• B) They contain homologous domains in the membrane spanning regions.
• C) They all contain voltage-sensing segments that close the channel in response to a particular membrane potential.
• D) They are capable of moving ions in both directions across a membrane.
• E) None of the answers is correct.

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