What Are the α- and β-Subunits of the Sodium-Potassium ATP

question 33

Multiple Choice

What are the α- and β-subunits of the sodium-potassium ATP responsible for?

• A) The α-subunit is responsible for binding sodium ions. The β-subunit is responsible for binding potassium ions.
• B) The α-subunit is responsible for the enzymatic activity of the pump and contains all the substrate-binding sites. The β-subunit has several extracellular glycosylation sites and is necessary for pump function.
• C) The α-subunit is responsible for binding sodium and potassium ions. The β-subunit is the substrate of phosphorylation.
• D) The α-subunit is not necessary for pump function. The β-subunit contains binding sites for sodium, potassium and ATP.
• E) The sodium-potassium ATPase consists of a single polypeptide chain without a β-subunit.

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