Which of the Following Is (Are)characteristic of the (Na⁺-K⁺)-ATPase

question 19

Multiple Choice

Which of the following is (are) characteristic of the (Na⁺-K⁺) -ATPase?
(I) It binds Na⁺ and K⁺ simultaneously prior to binding ATP
(II) It is covalently modified by phosphorylation at an Asp residue when Na⁺ is present.
(III) Transport of Na⁺ and K⁺ occur in a 1:1 ratio,thus maintaining a balanced gradient until opening of the gated portion of the channel.
(IV) It is essential for excitation of nerve cells.

• A)I,II,IV
• B)II,III,IV
• C)II,IV
• D)II,III
• E)II

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