The movement of a molecule from an area of high concentration to an area of low concentration by interacting with a carrier protein is an example of
A) osmosis.
B) active transport.
C) diffusion.
D) facilitated diffusion.
E) filtration.

Question

Quizplus · Accepted Answer

This process is called facilitated diffusion, where the molecule is still moving down its concentration gradient but it requires the assistance of a carrier protein to cross the cell membrane. Osmosis is the movement of water molecules across a selectively permeable membrane from an area of high water concentration to an area of low water concentration. Active transport requires the input of energy to move molecules against their concentration gradient. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration without the assistance of a carrier protein. Filtration is the movement of molecules through a membrane under pressure.

The Movement of a Molecule from an Area of High