When a Cell Is in Equilibrium with Its Environment, Which

Multiple Choice

When a cell is in equilibrium with its environment, which of the following processes occurs for substances that can diffuse through the plasma membrane?

A) There is directed movement of substances into and out of the cell.
B) There is random movement of substances into and out of the cell.
C) There is no movement of substances into or out of the cell.
D) All movement of molecules across the plasma membrane occurs by active transport.