The process by which molecules such as oxygen are moved into cells along their concentration gradient directly through the cell membrane is called
A) osmosis.
B) diffusion.
C) active transport.
D) osmosis
E) exocytosis.

Question

Quizplus · Accepted Answer

The process described in the question is diffusion, as it involves the movement of molecules along their concentration gradient directly through the cell membrane. Osmosis is a similar process but specifically refers to the movement of water molecules. Active transport and exocytosis both involve the use of energy to move molecules across the cell membrane in a way that is not directly along their concentration gradient.

The Process by Which Molecules Such as Oxygen Are Moved