Carbon dioxide is a small molecule that moves through the phospholipid bilayer with its concentration gradient by:
A)osmosis.
B)facilitated diffusion.
C)primary active transport.
D)simple diffusion.

Question

Quizplus · Accepted Answer

Carbon dioxide is a small nonpolar molecule that can easily move through the phospholipid bilayer by simple diffusion, down its concentration gradient from an area of high concentration to an area of low concentration. This does not require any energy or assistance from membrane proteins. Osmosis is the movement of water molecules across a selectively permeable membrane, facilitated diffusion requires a transport protein to move molecules across the membrane, and primary active transport requires the use of ATP to move molecules against their concentration gradient.

Carbon Dioxide Is a Small Molecule That Moves Through the Phospholipid