Multiple Choice
What is facilitated diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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What is the similarity between simple diffusion and facilitated diffusion?
A
Both processes involve the movement of substances down their concentration gradient.
B
Both processes are specific to the transport of ions.
C
Both processes require energy input from the cell.
D
Both processes require the use of transport proteins.
Verified step by step guidance1
Begin by understanding the concept of diffusion: Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration, down their concentration gradient.
Identify the characteristics of simple diffusion: Simple diffusion does not require energy input or transport proteins. It occurs directly through the lipid bilayer of the cell membrane.
Identify the characteristics of facilitated diffusion: Facilitated diffusion also moves substances down their concentration gradient but requires the assistance of transport proteins embedded in the cell membrane.
Compare the energy requirements: Neither simple diffusion nor facilitated diffusion requires energy input from the cell, distinguishing them from active transport processes.
Examine the role of transport proteins: Simple diffusion does not involve transport proteins, whereas facilitated diffusion specifically requires them to help move substances across the cell membrane.
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