6. The Membrane

The rate of diffusion of a substance across the plasma membrane depends on which of the following factors?

Which of the following variables affects the rate of diffusion across a membrane?

The rate of diffusion of a molecule into a cell is affected by which of the following factors?

Which of the following would not diffuse through the plasma membrane by means of simple diffusion?

If oxygen is more concentrated outside a cell than inside, what will most likely happen to the oxygen molecules?