---
title: "ATP Hydrolysis — AP Biology Definition & Exam Guide"
description: "ATP hydrolysis breaks ATP into ADP and a phosphate, releasing energy that powers cell work. Learn how it drives energy coupling and shows up on the AP Bio exam."
canonical: "https://fiveable.me/ap-bio/key-terms/atp-hydrolysis"
type: "key-term"
subject: "AP Biology"
---

# ATP Hydrolysis — AP Biology Definition & Exam Guide

## Definition

ATP hydrolysis is the process by which water is used to break down ATP (adenosine triphosphate) into ADP (adenosine diphosphate), releasing energy stored in the phosphate bonds.

## Related Study Guides

- [3.2 Environmental Impacts on Enzyme Function](/ap-bio/unit-3/enzyme-catalysis/study-guide/Jg1jljQ8ZHUvcaKprPGy)

## Review

### Related Terms

- Enzyme Activity: The measure of the ability of an enzyme to facilitate a reaction at maximum speed under optimal conditions.
- Energy Coupling: The use of an exergonic process (releases energy) to drive an endergonic one (requires input of energy).
- [Phosphorylation](/ap-bio/key-terms/phosphorylation): A biochemical process that involves the addition of phosphate to an organic compound.