- ATP hydrolysis is an exergonic reaction involving the cleavage of a chemical bond by water.
- The chemical reactants are ATP and water, and the products are ADP, an inorganic phosphate group (\(PO_4\)), and energy.
- Comparing these components against the given choices reveals that only option (c) correctly represents the reaction.
- The correct chemical reaction is: \(H_2O + ATP \rightarrow ADP + PO_4 + \text{energy}\). Therefore, the final answer is \(\boxed{c}\).
Explanation
- Understanding ATP Hydrolysis
ATP, or Adenosine Triphosphate, is a critical molecule in cellular biology, often referred to as the "energy currency" of the cell. The hydrolysis of ATP is the fundamental reaction by which the cell releases usable chemical energy. The term "hydrolysis" comes from the Greek words "hydro" (water) and "lysis" (breaking or splitting). Thus, in the context of ATP hydrolysis, a molecule of water is added to ATP to break the chemical bond holding the terminal phosphate group to the adenosine diphosphate (ADP) core.
- Identifying Reactants and Products
In a chemical reaction, the reactants are the substances consumed during the reaction, and the products are the substances formed. For the hydrolysis of ATP, the reactants are ATP and water (\(H_2O\)). The products formed are Adenosine Diphosphate (ADP) and an inorganic phosphate group, typically denoted as \(PO_4\) or \(P_i\). Crucially, the process of breaking the bond between the terminal phosphate and the ADP molecule is exergonic, meaning it releases a significant amount of potential chemical energy. Therefore, energy is listed as a product on the right side of the chemical equation. The overall balanced process is represented as:
\[ATP + H_2O \rightarrow ADP + PO_4 + \text{energy}\]
- Evaluating the Provided Options
We can now compare our derived equation with the provided options:
A\(ADP + PO_4 + \text{energy} \rightarrow H_2O + ATP\) (This describes ATP synthesis, not hydrolysis.)
B\(H_2O + ADP \rightarrow ATP + PO_4 + \text{energy}\) (This is incorrect, as ATP is a reactant in hydrolysis.)
C\(H_2O + ATP \rightarrow ADP + PO_4 + \text{energy}\) (This matches our derived reaction.)
D\(H_2O + ATP + \text{energy} \rightarrow ADP + PO_4\) (This is incorrect, as it suggests the reaction consumes energy instead of releasing it.)
Option (c) correctly identifies that water and ATP are reactants, while ADP, inorganic phosphate, and energy are the products.
- Conclusion
Based on the analysis of the biological mechanism and the stoichiometry of the chemical reaction, the correct representation for the hydrolysis of ATP is:
\[H_2O + ATP \rightarrow ADP + PO_4 + \text{energy}\]
Therefore, the correct option is (c). \(\boxed{c}\)
Examples
Think of a battery in a toy or a flashlight. When you use the device, the chemical energy stored inside the battery is converted into electrical energy, allowing the device to function. Similarly, your body stores energy in the chemical bonds of ATP. When your muscles contract or your brain cells transmit signals, your body "uses" the battery (ATP) by performing hydrolysis, releasing the stored energy precisely where and when it is needed. Just like you recharge a battery, your body also has metabolic pathways to rebuild (synthesize) ATP from ADP and phosphate, ensuring the cycle of energy consumption and regeneration continues.