Multiple Choice
What role do carrier proteins play in facilitated diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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What is the primary difference between facilitated diffusion and simple diffusion?
A
Facilitated diffusion requires energy input, while simple diffusion does not.
B
Simple diffusion occurs only in non-polar molecules, while facilitated diffusion occurs only in polar molecules.
C
Facilitated diffusion involves the use of transport proteins, while simple diffusion does not.
D
Simple diffusion can move substances against their concentration gradient, while facilitated diffusion cannot.
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. It is a passive process, meaning it does not require energy input.
Differentiate between simple and facilitated diffusion: Simple diffusion occurs directly across the phospholipid bilayer of the cell membrane, typically involving small or non-polar molecules that can easily pass through the lipid layer.
Identify the role of transport proteins in facilitated diffusion: Facilitated diffusion involves the use of specific transport proteins embedded in the cell membrane to help move substances across. These proteins provide a pathway for polar or larger molecules that cannot easily pass through the lipid bilayer.
Clarify the energy requirement: Both simple and facilitated diffusion are passive processes, meaning they do not require energy input from the cell. This is a key distinction from active transport, which does require energy.
Summarize the primary difference: The main difference between facilitated diffusion and simple diffusion is the involvement of transport proteins in facilitated diffusion, which assist in the movement of molecules that cannot diffuse directly through the lipid bilayer.
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