Multiple Choice
Active transport is different from simple diffusion because active transport:
9. Transport Across Membranes
Principles of Transmembrane Transport
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Which of the following is an example of primary active transport across a cell membrane?
A
Osmosis of water through aquaporin channels driven by a water potential difference
B
Facilitated diffusion of glucose into a cell through a GLUT transporter down its concentration gradient
C
Simple diffusion of O2 across the lipid bilayer down its concentration gradient
D
The Na+/K+ ATPase pumping Na+ out of the cell and K+ into the cell using ATP hydrolysis
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