Multiple Choice
Which of the following is a passive mechanism used to move materials into and out of the cell?
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6. The Membrane
Passive vs. Active Transport
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How do diffusion and facilitated diffusion differ?
A
Facilitated diffusion only occurs in plant cells, while simple diffusion occurs in all cells.
B
Facilitated diffusion moves substances against their concentration gradient, while simple diffusion moves them down the gradient.
C
Facilitated diffusion requires energy input from ATP, while simple diffusion does not.
D
Facilitated diffusion requires membrane proteins to transport substances, while simple diffusion does not.
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.
Learn about simple diffusion: Simple diffusion occurs directly across the phospholipid bilayer of the cell membrane without the need for any additional structures or energy input.
Explore facilitated diffusion: Facilitated diffusion also moves substances down their concentration gradient, but it requires the assistance of membrane proteins, such as channel or carrier proteins, to transport molecules that cannot pass directly through the lipid bilayer (e.g., polar or large molecules).
Clarify the difference in energy requirements: Neither simple diffusion nor facilitated diffusion requires energy input from ATP, as both are passive transport mechanisms.
Summarize the key distinction: The main difference is that facilitated diffusion relies on membrane proteins to transport substances, while simple diffusion does not involve any proteins and occurs directly through the lipid bilayer.
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