Multiple Choice
In the context of transmembrane transport, what is the main difference between simple diffusion and facilitated diffusion across a lipid bilayer?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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In the context of principles of transmembrane transport, active transport across a membrane requires which of the following?
A
Only a phospholipid bilayer, because transporters are not involved in active transport
B
Movement of solutes down their concentration gradient through an open channel without energy input
C
Equal solute concentrations on both sides of the membrane so that net flux is zero
D
An input of energy (e.g., ATP hydrolysis or coupling to an ion gradient) to move solutes against their electrochemical gradient
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