A cell is placed in a solution of large nutrient molecules tagged with a red dye.Soon the cell is dark red,showing a concentration of the nutrient much higher than the external solution.We add a reagent that blocks the use of ATP.What result would you expect from this experiment?
A) The nutrient would continue to rapidly enter the cell by diffusion because as a nutrient it is constantly being used in cell metabolism, so the cell will get redder.
B) The color will remain the same since all future transfer will stop.
C) The color will fade as the import of the nutrient stops and diffusion evens the concentrations.
D) The cell will continue to get darker since the import of the nutrient does not involve ATP.
E) The cell will die without access to ATP.

Question

Quizplus · Accepted Answer

Because of its large size, the red dye is being actively transported across the membrane into the cell. If ATP usage is blocked, active transport will stop, and because the membrane is impermeable to the dye, the color will remain the same.

A Cell Is Placed in a Solution of Large Nutrient