There are two main ways in which molecules are transported into and out of cells - active transport and passive transport. Which of the following statements is true of passive transport?
Passive transport is a process by which molecules move across the cell membrane without the requirement of energy. Instead, it relies on the natural tendency of molecules to move from an area of higher concentration to an area of lower concentration.
The correct statement about passive transport is that it occurs along the concentration gradient. This means that molecules move from an area of higher concentration to an area of lower concentration until equilibrium is reached.
To determine the answer, you could consider the other options and eliminate them. For example, active transport requires energy, so it wouldn't be a true statement about passive transport. Facilitated diffusion, which is a type of passive transport, involves the use of protein channels or carrier molecules to assist in the movement of molecules. Therefore, the remaining option, "It occurs along the concentration gradient," is the true statement about passive transport.