The major ATP-powered pump responsible for maintaining ion gradients across the plasma membrane of mammalian cells is:
A) the calmodulin-activated plasma membrane Ca²⁺ ATPase.
B) the sarcoplasmic reticulum Ca²⁺ ATPase.
C) the vacuolar F-class proton pump.
D) the plasma-membrane Na⁺/K⁺ ATPase.
Correct Answer:
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