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?
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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