Multiple Choice
In the context of principles of transmembrane transport, which statement best describes a key difference between simple diffusion and facilitated diffusion across a 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, how is facilitated diffusion similar to simple diffusion?
A
Both can transport solutes against their concentration gradient as long as a membrane protein is present.
B
Both exhibit saturation kinetics in which transport rate plateaus at high solute concentration.
C
Both require a specific membrane transport protein that binds the solute and undergoes a conformational change each transport cycle.
D
Both move solutes down their concentration (electrochemical) gradient and do not require direct ATP hydrolysis.
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