Carbon Dioxide Crosses the Plasma Membrane by Simple Diffusion

Multiple Choice

Carbon dioxide crosses the plasma membrane by simple diffusion. The rate at which carbon dioxide enters the cell is determined by the

A) amount of energy being produced by the cell.
B) concentration of carbon dioxide on each side of the membrane.
C) amount of oxygen being exported from the cell.
D) amount of transport protein in the membrane.
E) amount of carbon dioxide outside of the cell.