AP Biologymediummcq1 pt
In cotransport, glucose is often pulled into cells by
A.riding the Na⁺ gradient into the cell
B.direct ATP hydrolysis at the transporter
C.simple diffusion through the bilayer
D.exocytosis of glucose vesicles
Explanation
Core Concept
A symporter couples glucose's uphill movement to sodium's downhill flow; the Na⁺/K⁺ pump then restores the gradient. This indirect scheme is secondary active transport.
Correct Answer
Ariding the Na⁺ gradient into the cell
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