A charged molecule which moves down its concentration gradient and across a pore in a cell membrane without energy being expended by the cell is experiencing _____.
A)simple diffusion
B)osmosis
C)active transport
D)facilitated diffusion

Question

Quizplus · Accepted Answer

This scenario describes facilitated diffusion where a molecule, in this case, a charged one, moves down its concentration gradient (from high to low concentration) through a pore in the cell membrane with the help of a carrier protein. Since energy is not expended by the cell, it is a passive process.

A Charged Molecule Which Moves Down Its Concentration Gradient and Across