Question

The ratio of Na^+ and K^+ transported by Na^+/K^+-ATPase pump is ___________

(a) 1:1

(b) 2:1

(c) 2:3

(d) 3:2

The question was posed to me during a job interview.

My doubt stems from Movement of Substances Across Cell Membranes in section Cellular Membranes of Cell Biology

Answer 1

Correct answer is (d) 3:2

Best explanation: The sodium potassium pump is an active transporter that uses ATP to transport Na and K ions across a membrane. With each ATP used the pump exports 3 Sodium ions while it imports 2 Potassium ions into the cell.