When 10,000 molecules of ATP are hydrolyzed to ADP and Pi in a test tube, about twice as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation?
A)Cells are open systems, but a test tube is a closed system.
B)Cells are less efficient at heat production than nonliving systems.
C)The hydrolysis of ATP in a cell produces different chemical products than does the reaction in a test tube.
D)The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes.
E)Reactant and product concentrations are not the same

Question

Quizplus · Accepted Answer

In a test tube, the reaction occurs under standard conditions, while in cells, the concentrations of reactants and products are regulated, affecting the amount of heat released.

When 10,000 Molecules of ATP Are Hydrolyzed to ADP and Pi