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 concentration of X inside the cell increase to 5 millimolar.
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 size of the cell swell.

Question

Quizplus · Accepted Answer

Primary active transport involves the movement of substances against their concentration gradient using energy directly from ATP. Choice A indicates that substance X is moving from a lower concentration outside the cell to a higher concentration inside the cell, which is characteristic of primary active transport.

Which Would Be True If Substance X Was Moving into a Cell