When 10,000 molecules of ATP are hydrolyzed to ADP and i in a ...

[Hawke]

When 10,000 molecules of ATP are hydrolyzed to ADP and  i 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 in the test tube are different from those in the cell.

[coco]

It's most likely E. It makes sense given what's in the textbook.

[Hawke]

Thanks, and your suggestion was right.