Question

Which is the best description of the dynamic equilibrium that occurs across cell membranesA. Cell membranes will merge into one another only when the two cells are at equilibriumB. Phospholipid bilayers are always movingC. Concentrations will shift up and down tiny amounts, but hover around the same levelsD. Charged particles will dynamically connect with their opposites

Answer 1

C. Concentrations will shift up and down tiny amounts, but hover around the same levels.

The concentration of ions outside the cell and inside the cell will differ depending on what the body needs. There will be times that the charge inside the cell is more positive due to higher concentration of positive ions than outside the cell. But it will tend to go back into equilibrium like pumping out the excess ions out of the cell.