Question

Which molecule is most likely to pass through a cell membrane by simple diffusion?

A. Insulin (a small protein)
B. Glucose
C. A sodium ion
D. Carbon dioxide

Answer 1

Carbon dioxide is the molecule most likely to pass through a cell membrane by simple diffusion.

Step-by-step explanation:

The molecule most likely to pass through a cell membrane by simple diffusion is Carbon dioxide.

Simple diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration without the use of energy. Carbon dioxide is a small, non-polar molecule that can pass through the cell membrane freely. It is able to diffuse down its concentration gradient, moving from an area of higher concentration to an area of lower concentration.