Multiple Choice
Which of these statements describes what occurs in facilitated diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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Which of the following statements correctly describes a similarity between simple diffusion and facilitated diffusion?
A
Both processes can move molecules against their concentration gradient.
B
Both processes require the presence of transport proteins.
C
Both processes involve the movement of molecules down their concentration gradient.
D
Both processes require energy input from the cell.
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, while facilitated diffusion requires the help of transport proteins to move molecules across the cell membrane.
Identify the role of concentration gradients: Both simple and facilitated diffusion involve the movement of molecules down their concentration gradient, meaning from high to low concentration, without the need for energy input.
Clarify the energy requirement: Neither simple diffusion nor facilitated diffusion requires energy input from the cell, as they are passive transport processes.
Recognize the role of transport proteins: Facilitated diffusion requires transport proteins to help move molecules across the membrane, whereas simple diffusion does not.
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