Multiple Choice
How is simple diffusion different from facilitated diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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Which of the following statements accurately describes an aspect of facilitated diffusion?
A
It involves the direct fusion of vesicles with the plasma membrane.
B
It requires the assistance of membrane proteins to transport substances across the cell membrane.
C
It moves substances against their concentration gradient using energy from ATP.
D
It allows only water molecules to pass through the membrane.
Verified step by step guidance1
Facilitated diffusion is a type of passive transport, meaning it does not require energy input from ATP. Begin by understanding that substances move down their concentration gradient (from high to low concentration) during this process.
Identify the role of membrane proteins in facilitated diffusion. These proteins assist in transporting substances that cannot pass directly through the lipid bilayer due to their size, polarity, or charge.
Distinguish facilitated diffusion from other processes like active transport, which moves substances against their concentration gradient and requires energy from ATP.
Clarify that facilitated diffusion is not limited to water molecules. While water can move through the membrane via aquaporins (a type of channel protein), facilitated diffusion also applies to ions, glucose, and other molecules.
Eliminate incorrect options by comparing them to the characteristics of facilitated diffusion. For example, vesicle fusion with the plasma membrane is part of exocytosis, not facilitated diffusion.
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