Multiple Choice
In the context of principles of transmembrane transport, which molecule is directly used as an energy source for primary active transport across the plasma membrane?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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In the context of principles of transmembrane transport, what does active transport require to move a solute across a membrane against its electrochemical gradient?
A
No membrane protein; solute crosses freely through the lipid bilayer regardless of polarity
B
An input of energy, such as ATP hydrolysis or coupling to an ion gradient
C
Only an open aqueous channel (pore) that permits passive diffusion
D
Movement of solute down its concentration gradient without energy input
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