Multiple Choice
Which of the following is NOT part of the passive transport process?
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6. The Membrane
Passive vs. Active Transport
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Which of the following best describes a key difference between facilitated diffusion and simple diffusion?
A
Facilitated diffusion only occurs in plant cells, while simple diffusion occurs in all cell types.
B
Facilitated diffusion moves substances against their concentration gradient, while simple diffusion moves them down their gradient.
C
Facilitated diffusion requires membrane proteins to transport substances across the membrane, while simple diffusion does not.
D
Facilitated diffusion requires energy input from ATP, 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. It is a passive process, meaning it does not require energy input.
Learn about simple diffusion: Simple diffusion occurs when molecules move directly across the phospholipid bilayer of the cell membrane without the assistance of proteins. This process is limited to small, nonpolar molecules like oxygen (O₂) and carbon dioxide (CO₂).
Understand facilitated diffusion: Facilitated diffusion is also a passive process, but it requires the help of membrane proteins, such as channel or carrier proteins, to transport substances across the cell membrane. This is necessary for larger or polar molecules, like glucose or ions, that cannot pass through the lipid bilayer on their own.
Compare the two processes: The key difference is that facilitated diffusion requires specific membrane proteins to assist in the transport of substances, while simple diffusion does not. Both processes move substances down their concentration gradient and do not require energy input from ATP.
Eliminate incorrect options: Facilitated diffusion does not occur only in plant cells—it occurs in all cell types. It does not move substances against their concentration gradient, nor does it require ATP. The correct answer is that facilitated diffusion requires membrane proteins, while simple diffusion does not.
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