If the Concentration of a Solute Is the Same Both

Multiple Choice

If the concentration of a solute is the same both inside and outside the cell,what might you expect with regard to its transport by a membrane protein?

A) Since there is no concentration gradient,no transport either in or out of the cell is possible.
B) Movement of the solute across the membrane could occur and cause accumulation on one side of the membrane by an active transport protein.
C) The transport protein has been saturated.
D) The solute must be phosphorylated with a phosphate group from ATP before further transport can occur.