11. Biological Membranes and Transport

The difference between simple and facilitated diffusion is that facilitated diffusion:

The rate of movement (flux) of a substance X into cells was measured at different concentrations of X to construct the following graph. Does the graph's data suggest diffusion of X into cells is mediated by a protein transporter?

The rate of transfer across a membrane is measured for a given molecule. The diffusion rate is seen to be hyperbolic with respect to the concentration of the diffusing molecule. The method of transport is which of the following?

Simple diffusion and facilitated diffusion across a membrane both ___________________: