Multiple Choice
Which of the following sets correctly lists three major types of active transmembrane transport used by cells?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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In the context of principles of transmembrane transport, when would a cell have to use active transport to move a solute across the plasma membrane?
A
When moving water across the membrane by osmosis through aquaporins.
B
When moving a solute from higher concentration to lower concentration through a simple diffusion pathway.
C
When moving a solute down its electrochemical gradient through an ion channel (facilitated diffusion).
D
When moving a solute from lower concentration to higher concentration (against its electrochemical gradient).
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