In the accompanying diagram, the dark dots indicate small molecules. These molecules are moving out of the
cells, as indicated by the arrows. The number of dots inside and outside of the two cells represents the relative
concentrations of the molecules inside and outside of the cells.
Cell A
ATP is being used to move the molecules out of the cell by
A cell A, only
C. both cell A and cell B
B.
D
Cell B
cell B, only
neither cell A nor cell B
