Multiple Choice
Which of the following is an example of facilitated diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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How is simple diffusion different from facilitated diffusion in passive transport?
A
Simple diffusion requires energy input, while facilitated diffusion does not.
B
Simple diffusion can only occur in the presence of a concentration gradient, while facilitated diffusion does not require a gradient.
C
Simple diffusion is specific to ions, whereas facilitated diffusion is specific to water molecules.
D
Simple diffusion involves the movement of molecules through a membrane without the aid of proteins, while facilitated diffusion requires transport proteins.
Verified step by step guidance1
Understand the concept of passive transport: Passive transport is the movement of molecules across a cell membrane without the need for energy input. It relies on the concentration gradient, moving substances from an area of higher concentration to an area of lower concentration.
Define simple diffusion: Simple diffusion is a type of passive transport where molecules move directly through the phospholipid bilayer of the cell membrane without the assistance of any proteins. This process is driven solely by the concentration gradient.
Define facilitated diffusion: Facilitated diffusion is another type of passive transport where molecules move across the cell membrane with the help of transport proteins. These proteins provide a pathway for certain molecules that cannot easily pass through the lipid bilayer on their own.
Identify the key difference: The main difference between simple diffusion and facilitated diffusion is the involvement of transport proteins. Simple diffusion does not require any proteins, while facilitated diffusion relies on specific proteins to help move molecules across the membrane.
Clarify the role of concentration gradient: Both simple and facilitated diffusion depend on the presence of a concentration gradient. Molecules move from areas of high concentration to areas of low concentration in both processes, but facilitated diffusion requires the assistance of proteins to do so.
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