Which of the following is true about the rate of diffusion through a selectively permeable membrane
1. The size of the molecules has no effect on the rate of diffusion through the membrane.
2. Smaller molecules diffuse faster than larger molecules through a membrane.
3. Larger molecules diffuse faster than smaller molecules through a membrane.
4. All molecules diffuse at the same rate through the membrane.
Answer: 2. Smaller molecules diffuse faster than larger molecules through a membrane.
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