Multiple Choice
What is the primary difference between simple diffusion and facilitated diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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How does simple diffusion differ from facilitated diffusion?
A
Simple diffusion occurs only in the presence of a concentration gradient, while facilitated diffusion does not.
B
Simple diffusion involves the movement of water molecules, while facilitated diffusion involves ions.
C
Simple diffusion requires energy input, while facilitated diffusion does not.
D
Simple diffusion does not require a membrane protein, while facilitated diffusion does.
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 is driven by the concentration gradient and does not require energy input.
Differentiate between simple and facilitated diffusion: Simple diffusion involves the passive movement of molecules directly through the lipid bilayer of the cell membrane without the need for any additional structures. Facilitated diffusion, on the other hand, requires the presence of specific membrane proteins to assist in the transport of molecules across the cell membrane.
Identify the role of membrane proteins in facilitated diffusion: Facilitated diffusion relies on transport proteins, such as channel proteins or carrier proteins, embedded in the cell membrane. These proteins provide a pathway for certain molecules, like ions or larger polar molecules, to pass through the membrane.
Clarify the energy requirement: Both simple and facilitated diffusion are passive transport processes, meaning they do not require energy input from the cell. They rely solely on the concentration gradient to drive the movement of molecules.
Summarize the key difference: The main distinction between simple and facilitated diffusion is the requirement of membrane proteins. Simple diffusion occurs without the aid of proteins, while facilitated diffusion requires specific proteins to transport molecules across the cell membrane.
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