Multiple Choice
How is facilitated diffusion different from simple diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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Which characteristic is shared by both simple diffusion and facilitated diffusion?
A
Both involve the movement of molecules down their concentration gradient.
B
Both require transport proteins to function.
C
Both require energy input from the cell.
D
Both are forms of active transport.
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, down their concentration gradient.
Differentiate between simple diffusion and facilitated diffusion: Simple diffusion occurs directly across the phospholipid bilayer without the need for transport proteins, while facilitated diffusion requires transport proteins to help molecules cross the membrane.
Identify the energy requirement: Both simple diffusion and facilitated diffusion are passive transport processes, meaning they do not require energy input from the cell.
Clarify the role of transport proteins: Facilitated diffusion involves transport proteins, such as channel or carrier proteins, to assist in the movement of molecules across the cell membrane.
Recognize the type of transport: Both simple diffusion and facilitated diffusion are forms of passive transport, not active transport, as they do not require energy and move molecules down their concentration gradient.
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