A researcher claims that the synthesis of ATP from ADP and inorganic phosphate (Pi) is essential to cellular function.

Which of the following statements best helps justify the researcher’s claim?

Question

A researcher claims that the synthesis of ATP from ADP and inorganic phosphate (Pi) is essential to cellular function.

Which of the following statements best helps justify the researcher’s claim?

BlackTom AI · Accepted Answer

ATP synthase is a mitochondrial enzyme that catalyzes the conversion of ADP and Pi to ATP.

1) Relevant knowledge points and concepts
- ATP is the primary immediate energy currency of the cell; many cellular processes (biosynthesis, active transport, motility) depend on ATP hydrolysis for energy.
- ATP synthase is an enzyme complex embedded in the inner mitochondrial membrane (and in chloroplast thylakoid and bacterial plasma membranes) that synthesizes ATP from ADP and inorganic phosphate (Pi).
- The chemiosmotic mechanism: electron transport generates a proton gradient (proton-motive force) that drives ATP synthase, coupling transmembrane proton flow to phosphorylation of ADP.

2) Step-by-step reasoning
- Cells continuously consume ATP for essential processes; therefore, ATP must be continuously regenerated.
- The direct enzymatic route for regenerating ATP from its breakdown products (ADP + Pi) is the reaction catalyzed by ATP synthase.
- Without functional ATP synthase (or an equivalent mechanism), cells cannot efficiently reconvert ADP and Pi back into ATP at rates high enough to sustain life, so ATP synthesis is essential.

3) Intermediate steps/process flow
- Nutrient oxidation (glycolysis, citric acid cycle) produces NADH/FADH2 → electron transport chain pumps protons → proton gradient forms → protons flow back through ATP synthase → ATP synthase catalyzes ADP + Pi → ATP.

4) Why the correct answer is correct
- The statement that "ATP synthase is a mitochondrial enzyme that catalyzes the conversion of ADP and Pi to ATP" directly links a known enzymatic mechanism to ATP production. This mechanistic link explains how ATP is replenished to support cellular functions, thereby justifying the claim that ATP synthesis is essential.

5) Why the other options are incorrect or less appropriate
- A: ADP as a signaling molecule is not a general justification for the essentiality of ATP synthesis; it’s not the primary reason cells must synthesize ATP.
- C: While cells acquire Pi from the environment, that fact alone doesn’t explain why synthesizing ATP is essential—Pi availability is only one substrate requirement.
- D: ATP hydrolysis being energy-releasing is true and explains why ATP is useful, but it describes consumption, not the enzymatic mechanism that makes ATP available again. It does not directly justify why the synthesis reaction (and the enzyme that catalyzes it) is essential.

6) Conclusion
The best justification is that ATP synthase catalyzes ADP + Pi → ATP, so the correct answer is: "ATP synthase is a mitochondrial enzyme that catalyzes the conversion of ADP and Pi to ATP." This matches the provided answer.

A researcher claims that the synthesis of ATP from ADP and inorganic phosphate (Pi) is essential to cellular function. Which of the following statements best helps justify the researcher’s claim?Single choice

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