Multiple Choice
What is the similarity between simple diffusion and facilitated diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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Which of the following accurately describes a difference between simple and facilitated diffusion?
A
Facilitated diffusion requires energy input, while simple diffusion does not.
B
Simple diffusion can move molecules against their concentration gradient, while facilitated diffusion cannot.
C
Facilitated diffusion occurs only in prokaryotic cells, while simple diffusion occurs in all cell types.
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. It is a passive process, meaning it does not require energy input.
Differentiate between simple and facilitated diffusion: Simple diffusion occurs directly across the phospholipid 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.
Identify the role of membrane proteins in facilitated diffusion: Facilitated diffusion involves transport proteins such as channel proteins or carrier proteins that help move substances across the cell membrane. These proteins provide a pathway for molecules that cannot easily pass through the lipid bilayer due to their size or polarity.
Clarify the energy requirement: Both simple and facilitated diffusion are passive processes, meaning they do not require energy input from the cell. This is a key distinction from active transport, which does require energy.
Recognize the correct statement: The accurate difference between simple and facilitated diffusion is that simple diffusion does not require a membrane protein, while facilitated diffusion does. This is because facilitated diffusion relies on transport proteins to move molecules across the cell membrane.
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