Multiple Choice
In the context of principles of transmembrane transport, why does active transport require an input of energy (e.g., ATP hydrolysis or an ion gradient)?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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Which of the following is an active transport process across the plasma membrane?
A
Simple diffusion of O2 directly through the lipid bilayer
B
Facilitated diffusion of glucose through a GLUT transporter down its concentration gradient
C
Osmosis of water through aquaporins down its water potential gradient
D
Na+/K+ ATPase pumping Na+ out of the cell and K+ into the cell using ATP hydrolysis
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