Multiple Choice
What is a similarity between simple diffusion and facilitated diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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How is simple diffusion similar to facilitated diffusion?
A
Both processes move substances down their concentration gradient.
B
Both require energy input from the cell.
C
Both occur only in the presence of transport proteins.
D
Both involve the movement of water molecules only.
Verified step by step guidance1
Identify the key characteristics of simple diffusion: it is the movement of molecules from an area of higher concentration to an area of lower concentration without the need for energy input or transport proteins.
Identify the key characteristics of facilitated diffusion: it also involves the movement of molecules down their concentration gradient, but it requires the presence of transport proteins to assist in the process.
Compare the two processes: both simple diffusion and facilitated diffusion move substances down their concentration gradient, meaning from high to low concentration.
Consider the energy requirement: neither simple diffusion nor facilitated diffusion requires energy input from the cell, as both are passive transport processes.
Evaluate the role of transport proteins: simple diffusion does not require transport proteins, while facilitated diffusion does, which is a key difference between the two processes.
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