Multiple Choice
Which of the following is the best definition of active transport across a biological membrane?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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Which of the following is a form of active transmembrane transport (requires energy input)?
A
Na+ uptake driven by the Na+/K+ ATPase (a primary active transport pump)
B
Simple diffusion of O2 across the lipid bilayer
C
Facilitated diffusion of glucose through a GLUT transporter down its concentration gradient
D
Osmosis of water through aquaporins down a water potential gradient
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