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By which mechanism would a steroid molecule diffuse into the cell?
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6. The Membrane
Simple and Facilitated Diffusion
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What is a similarity between simple diffusion and facilitated diffusion?
A
Both processes move substances down their concentration gradient.
B
Both require the presence of transport proteins.
C
Both require energy input from ATP.
D
Both involve the movement of water molecules.
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Understand the concept of diffusion: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration, down their concentration gradient.
Identify the types of diffusion: Simple diffusion occurs directly across the phospholipid bilayer, while facilitated diffusion requires the help of transport proteins.
Compare energy requirements: Both simple and facilitated diffusion are passive transport processes, meaning they do not require energy input from ATP.
Consider the role of transport proteins: Simple diffusion does not involve transport proteins, whereas facilitated diffusion does require them to help move substances across the cell membrane.
Evaluate the movement of water molecules: The movement of water molecules specifically is called osmosis, which is a type of simple diffusion, but not all diffusion processes involve water.
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