Multiple Choice
Which of the following is a form of active transmembrane transport?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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Which of the following is an example of active transmembrane transport (requires energy input to move a solute against its electrochemical gradient)?
A
Water movement through aquaporins down an osmotic gradient
B
Na+ uptake by the Na+/K+ ATPase
C
Glucose movement into a cell via GLUT1 (facilitated diffusion)
D
Oxygen diffusion directly through the lipid bilayer
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