Multiple Choice
Which of the following statements about facilitated diffusion is false?
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6. The Membrane
Simple and Facilitated Diffusion
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What is the primary difference between simple diffusion and facilitated diffusion in cellular transport?
A
Facilitated diffusion moves molecules against their concentration gradient, while simple diffusion moves them along the gradient.
B
Facilitated diffusion requires a transport protein, while simple diffusion does not.
C
Simple diffusion occurs only in prokaryotic cells, while facilitated diffusion occurs in eukaryotic cells.
D
Simple diffusion requires energy, while facilitated 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. 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 phospholipid bilayer of the cell membrane without the need for any additional structures or energy.
Recognize the role of transport proteins in facilitated diffusion: Facilitated diffusion requires the assistance of specific transport proteins embedded in the cell membrane to help move larger or polar molecules across the membrane. These proteins provide a pathway for the molecules to pass through.
Clarify the energy requirement: Both simple and facilitated diffusion are passive transport processes, meaning they do not require cellular energy (ATP) to occur. They rely on the concentration gradient to drive the movement of molecules.
Identify the types of cells involved: Both simple and facilitated diffusion can occur in both prokaryotic and eukaryotic cells, as they are fundamental processes for cellular function and do not depend on the type of cell.
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