Multiple Choice
What is the primary difference between facilitated diffusion and simple diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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The difference between simple and facilitated diffusion is that facilitated diffusion:
A
Requires a protein transporter.
B
Moves molecules against their concentration gradient.
C
Requires energy.
D
Freely diffuses molecules against their concentration gradient.
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. This process does not require energy and occurs naturally due to the random movement of particles.
Differentiate between simple and facilitated diffusion: Simple diffusion involves the movement of small or nonpolar molecules directly through the lipid bilayer of the cell membrane without the need for any additional structures.
Explore facilitated diffusion: Facilitated diffusion, unlike simple diffusion, requires the assistance of protein transporters embedded in the cell membrane. These proteins help move larger or polar molecules across the membrane.
Identify the role of protein transporters: In facilitated diffusion, protein transporters such as channel proteins or carrier proteins provide a pathway for specific molecules to pass through the membrane, following their concentration gradient.
Clarify energy requirements: Facilitated diffusion does not require energy input (ATP) because it moves molecules down their concentration gradient, similar to simple diffusion, but with the help of transport proteins.
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