Which of the following phenomena best illustrates secondary active transport (cotransport)?
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Correct answer: Glucose entry into gut cells driven by the Na⁺ gradient
Glucose uptake that relies on Na⁺ moving down its gradient to drive glucose uptake against its gradient (via Na⁺–glucose symporter) is a classic example of secondary active transport, coupling one solute’s favorable movement to another’s unfavorable movement.
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