Multiple Choice
In the context of transmembrane transport, what is the key difference between simple diffusion and facilitated diffusion across a biological membrane?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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Active transport is different from simple diffusion because active transport:
A
always occurs directly through the lipid bilayer without the involvement of transport proteins
B
moves solutes only down their concentration gradient without requiring any energy input
C
can move solutes against their concentration or electrochemical gradient by using an energy source (e.g., ATP or an ion gradient)
D
is driven exclusively by random thermal motion of molecules and requires no membrane proteins
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