Membrane potential is determined by the:.a) number and types of ion-channel proteins present in the plasma membrane of a cell. b) concentration of cholesterol in a membrane. c) difference in concentration of ions and charged molecules on the two sides of a cell's plasma membrane. d) number and type of phospholipids present in a membrane.

Explanation:

Membrane potential is the difference in electric potential (voltage) between the inside and outside of a cell (between the interior and the exterior of the plasma membrane). Membrane potential is generated by the difference in concentration of ions and charged molecules on the two sides of a cell's plasma membrane.

It forces ions to passively move in one direction: positive ions are attracted by the 'negative' side of the membrane and negative ions by the 'positive' one.

well the answer is 2!