Multiple Choice
In the context of principles of transmembrane transport, which statement best describes how facilitated diffusion differs from simple diffusion across a cell membrane?
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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 transport across a cell membrane?
A
Movement of water across the membrane through aquaporins down its osmotic gradient
B
Diffusion of oxygen across the lipid bilayer from high to low concentration
C
Uptake of glucose into intestinal epithelial cells via the Na+/glucose symporter (SGLT) driven by the Na+ electrochemical gradient
D
Facilitated diffusion of glucose through a GLUT transporter down its concentration gradient
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