Which of the following statements is true among all types of passive transport?

Question

Quizplus · Accepted Answer

The concentration gradient, which is the difference in concentration of a molecule or ion between two areas, is the driving force in all types of passive transport, including simple diffusion, facilitated diffusion, and osmosis. A and B are incorrect because small polar molecules and ions can in fact cross the plasma membrane by passive transport, although they may require different types of transport proteins. D is incorrect because although some types of facilitated diffusion require proteins, simple diffusion and osmosis do not.

Which of the Following Statements Is True Among All Types