Multiple Choice
How do transporters and channels select which solutes they help move across the membrane?
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9. Transport Across Membranes
Transporters
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In most mammalian cells, how does glucose cross the plasma membrane into the cell?
A
By primary active transport via a plasma-membrane ATPase that pumps glucose using ATP hydrolysis
B
By facilitated diffusion through a GLUT uniporter down its concentration gradient
C
By simple diffusion directly through the lipid bilayer because glucose is nonpolar
D
By aquaporin channels that selectively conduct glucose along with water
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