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

question 80

Multiple Choice

When 10,000 molecules of ATP are hydrolyzed to ADP and ᵢin 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.

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Definitions:

Acidic Group

A functional group within a molecule that commonly donates protons (H+) and displays acidic properties, often containing oxygen and hydrogen.

Fatty Acid

Long hydrocarbon chains that are a major component of lipids, which can be saturated or unsaturated, serving as important sources of energy.

Carbon Atoms

The chemical building blocks of organic molecules, characterized by their ability to form stable bonds with other elements including themselves.

Nucleic Acids

Macromolecules that store and transmit genetic information, including DNA and RNA.