Question

which term names the process where particles are transported across a cell membrane using carrier proteins without any additional input energy?
endocytosis
osmosis
exocytosis
facilitated diffusion

Explanation:

Endocytosis and exocytosis are active - transport processes that require energy. Osmosis is the diffusion of water across a semi - permeable membrane. Facilitated diffusion uses carrier proteins to transport particles across a cell membrane down their concentration gradient without additional energy input.

Answer:

D. facilitated diffusion