Which would be true if substance X was moving into a cell by primary active transport?
A. A cell is placed into a 1 millimolar solution of substance X and over time you witness the size of the cell swell.
B. A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 1 millimolar.
C. A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell decrease to 0.5 millimolar.
D. A cell is placed into a 1 millimolar solution of substance X and over time you witness the size of the cell shrink.
E. A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 5 millimolar.
Answer: E
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