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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How is simple diffusion different from facilitated diffusion?
A
Simple diffusion occurs only in non-polar molecules, while facilitated diffusion occurs only in polar molecules.
B
Simple diffusion requires energy input, while facilitated diffusion does not.
C
Simple diffusion moves substances against their concentration gradient, while facilitated diffusion moves them along the gradient.
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 involves the movement of small or non-polar molecules directly through the lipid bilayer of the cell membrane without the need for any additional structures.
Recognize the role of membrane proteins in facilitated diffusion: Facilitated diffusion requires the presence of specific membrane proteins, such as channel proteins or carrier proteins, to help polar or larger molecules pass through the cell membrane.
Identify the concentration gradient: Both simple and facilitated diffusion move substances along their concentration gradient, from high to low concentration, without the need for energy.
Clarify the types of molecules involved: Simple diffusion typically involves non-polar molecules like oxygen and carbon dioxide, while facilitated diffusion is necessary for polar molecules like glucose and ions, which cannot easily pass through the lipid bilayer.
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