Cellular Energy—Which Statement Is FALSE? Select the false statement regarding the energy requirements and thermodynamics of living cells.

Introduction / Context:
Cells must obey thermodynamic laws while maintaining low internal entropy through continual energy intake and conversion. Importantly, cells cannot utilize energy by “rapid combustion” as in flames; instead they harness chemical energy in small, enzyme-controlled steps to generate ATP and reducing equivalents. This question asks you to identify the false statement about cellular energy use.

Given Data / Assumptions:

• Biochemical reactions require overcoming activation energies (often via enzymes).
• Energy is transduced through pathways such as glycolysis and oxidative phosphorylation.
• Combustion is an uncontrolled oxidation; biology uses controlled redox steps.

Concept / Approach:
Compare each statement to known principles. Statements A, B, C, and E align with thermodynamics and biochemistry. Statement D is false because “rapid combustion” is neither the mechanism nor the most usable energy form for cells. Instead, cells couple stepwise oxidations to synthesize ATP, generating usable energy in a regulated fashion without damaging heat spikes.

Step-by-Step Solution:

Verification / Alternative check:
Respirometry shows gradual oxygen consumption linked to ATP synthesis; uncoupling or rapid oxidation without ATP formation is wasteful and dangerous, underscoring why combustion is not used.

Why Other Options Are Wrong:

• A/B/C/E correctly describe cellular energy principles.

Common Pitfalls:
Equating calorimetric heat of combustion with biological “usability”; confusing thermodynamic favorability with the requirement for catalysis and coupling.

Final Answer:
The most usable energy for cells comes from the rapid combustion of glucose