Question

Facilitated diffusion of a molecule into a cell would be more rapid if

A. the concentration of the molecule in the cell increased.
B. the concentration of water in the cell decreased.
C. the concentration of the molecule outside the cell increased.
D. the cell was isotonic.

Answer 1

Facilitated diffusion of a molecule into a cell is accelerated when the concentration of that molecule is higher outside the cell, enhancing the concentration gradient.

Step-by-step explanation:

Facilitated diffusion of a molecule into a cell would be more rapid if the concentration of the molecule outside the cell increased. This is because facilitated diffusion relies on a concentration gradient, where the substance moves from an area of higher concentration to an area of lower concentration through specific protein channels in the membrane without the use of energy. Increasing the concentration outside the cell enhances this gradient, promoting the diffusion of the molecule into the cell.