When 10 000 Molecules of ATP Are Hydrolyzed to ADP

question 6

Multiple Choice

When 10 000 molecules of ATP are hydrolyzed to ADP and _i in a test tube, about half 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) The hydrolysis of ATP in a cell produces different chemical products than does the reaction in a test tube.
• B) Reactant and product concentrations in the test tube are different from those in the cell.
• C) The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes.
• D) Cells are less efficient at heat production than nonliving systems.
• E) Cells are open systems, but a test tube is an isolated system.

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