Question

what is diffusion?
molecules moving from one cell to another cell through a channel protein
molecules moving from a high concentration to a low concentration
molecules moving toward the nucleus after being synthesized by a ribosome

Explanation:

To determine the correct definition of diffusion, we analyze each option:

• The first option describes a process that involves channel proteins, which is more related to facilitated diffusion or other types of transport, not simple diffusion.
• The second option: Diffusion is defined as the movement of molecules from an area of high concentration to an area of low concentration, driven by the concentration gradient, and this does not require a channel protein or energy input in the case of simple diffusion.
• The third option describes a process related to the movement of molecules after synthesis by ribosomes (like protein transport within a cell), which is not diffusion.

Answer:

B. molecules moving from a high concentration to a low concentration