Use a diagram to distinguish between simple diffusion and facilitated diffusion?
Question: Use a diagram to distinguish between simple diffusion and facilitated diffusion?
Simple diffusion and facilitated diffusion are two types of passive transport that allow molecules to cross the plasma membrane of a cell. A diagram that can distinguish between them is shown below:
| Simple diffusion | Facilitated diffusion |
|
| Molecules move down their concentration gradient without the help of any protein. | Molecules move down their concentration gradient with the help of a carrier protein or a channel protein. |
| Molecules are usually small, nonpolar and hydrophobic, such as oxygen, carbon dioxide and lipids. | Molecules are usually large, polar or charged, such as glucose, amino acids and ions. |
| The rate of diffusion depends on the steepness of the concentration gradient, the temperature and the size of the molecule. | The rate of diffusion depends on the steepness of the concentration gradient, the availability of the protein and the specificity of the protein. |
The diagram illustrates the main differences between simple diffusion and facilitated diffusion in terms of the mechanism, the molecules involved and the factors affecting the rate of transport.
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