ATP Hydrolysis in a Test Tube Releases Only About Half

question 22

Multiple Choice

ATP hydrolysis in a test tube releases only about half as much energy as ATP hydrolysis in the cell. Which of the following is the best explanation for this observation?

• A) Cells maintain higher internal pressure, which speeds up the reaction rate.
• B) ATP hydrolysis in a test tube occurs under standard conditions; in the cell, reactant and product concentrations differ from standard conditions.
• C) ATP hydrolysis in a cell produces different products than ATP hydrolysis in a test tube.
• D) ATP hydrolysis in cells is catalyzed by enzymes, which releases more energy than the uncatalyzed reaction in a test tube.

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