Multiple Choice
Which of the following is an active transport process across the plasma membrane?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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A primary active transport process is one in which which of the following occurs?
A
Energy stored in an ion gradient (created by another pump) is used to drive transport of a second solute against its gradient
B
A solute moves down its concentration gradient through a channel without any energy input
C
Water moves across the membrane from lower solute concentration to higher solute concentration through aquaporins
D
A membrane protein directly uses energy from ATP hydrolysis to move a solute against its electrochemical gradient
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