Question

a researcher claims that the synthesis of atp from adp and inorganic phosphate (p₁) is essential to cellular function. which of the following statements best helps justify the researchers claim? a adp is a small molecule that some cells release into their environment as a way of communicating with other cells. b atp hydrolysis is an energy - releasing reaction that is often coupled with reactions that require an input of energy. c inorganic phosphate (p₁) is a substance that cells typically acquire from their environment. d atp synthase is a mitochondrial enzyme that catalyzes the conversion of adp and p₁ to atp

Explanation:

The researcher’s claim is that ATP synthesis from ADP and \(P_i\) is essential for cellular function. To justify this, we need a statement linking ATP to critical cellular processes. ATP’s key role is as an energy currency: its hydrolysis releases energy used for energy-requiring reactions (e.g., active transport, biosynthesis). Option B directly connects ATP hydrolysis (dependent on prior synthesis of ATP) to powering essential cellular reactions, explaining why ATP synthesis is necessary. Other options focus on ADP’s signaling (A), \(P_i\) acquisition (C), or ATP synthase location (D)—none address the functional necessity of ATP synthesis for cellular processes.

Answer:

B. ATP hydrolysis is an energy-releasing reaction that is often coupled with reactions that require an input of energy.