Question

Gases such as oxygen and carbon dioxide cross the plasma membrane by
Responses
A special gas transport proteins.special gas transport proteins.
B osmosis through the lipid bilayer.osmosis through the lipid bilayer.
C active transport through protein channels.active transport through protein channels.
D passive diffusion through the lipid bilayer.

Answer 1

The correct response is:

**D** passive diffusion through the lipid bilayer.

Oxygen and carbon dioxide are small, nonpolar molecules that can easily diffuse across the plasma membrane without the need for transport proteins.