Multiple Choice
How is simple diffusion different from facilitated diffusion in passive transport?
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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 moves molecules against their concentration gradient, while simple diffusion moves them along the gradient.
B
Facilitated diffusion requires energy input, while simple diffusion does not.
C
Facilitated diffusion occurs only in plant cells, while simple diffusion occurs in all cell types.
D
Facilitated diffusion involves the use of transport proteins, while simple diffusion does not.
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, driven by the concentration gradient.
Recognize simple diffusion: Simple diffusion is a passive process where molecules move directly through the phospholipid bilayer without the need for transport proteins.
Identify facilitated diffusion: Facilitated diffusion is also a passive process, but it requires the assistance of transport proteins to move molecules across the cell membrane.
Differentiate between the two: The primary difference is that facilitated diffusion uses transport proteins to help move molecules across the membrane, while simple diffusion does not involve transport proteins.
Clarify energy requirements: Both facilitated and simple diffusion do not require energy input, as they move molecules along the concentration gradient.
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