Final answer:
It is false that ion channels cannot transport ions across membranes at rates exceeding those predicted by Fick's law; ion channels provide a rapid, selective pathway for ion movement.
Step-by-step explanation:
The statement that ion channels cannot transport ions across membranes at rates faster than those predicted by Fick's law is false. Ion channels facilitate the movement of ions across cellular membranes at rates much faster than would occur through simple diffusion as described by Fick's law. The rapid transport of ions is possible because ion channels provide a hydrophilic path through the hydrophobic lipid bilayer. These channels are highly selective and can be either always open or gated, responding to various stimuli such as electrical or chemical signals. Additionally, certain cells have specialized mechanisms like the sodium-potassium pump, which actively transports ions against their concentration gradient, a process requiring energy.