Mechanisms of Transport

AP Biology· difficulty 4/5

The transport mechanism illustrated is BEST described as:

A
$Primary active transport - direct ATP hydrolysis on the carrier$
B
$Pinocytosis - engulfment of extracellular fluid$
C
$Simple diffusion - both molecules move down gradients$
D
$Secondary active transport - using a Na+ gradient to move glucose uphill$
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Explanation

Na+ flowing down its electrochemical gradient releases free energy that drives glucose uphill through the same carrier - secondary active transport.

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