---
title: "Metabolic Pathways — AP Bio Definition & Exam Guide"
description: "Metabolic pathways are step-by-step enzyme-catalyzed reaction series that build or break down molecules, connecting photosynthesis, respiration, and energy storage in AP Bio Unit 3."
canonical: "https://fiveable.me/ap-bio/key-terms/metabolic-pathways"
type: "key-term"
subject: "AP Biology"
---

# Metabolic Pathways — AP Bio Definition & Exam Guide

## Definition

Metabolic pathways are series of chemical reactions occurring within a cell. In each pathway, a principal chemical is modified by a series of chemical reactions. Enzymes catalyze these reactions, and often require dietary minerals, vitamins, and other cofactors in order to function properly.

## Related Study Guides

- [3.4 Photosynthesis](/ap-bio/unit-3/cellular-energy/study-guide/pOhMYoE7Yc4VJi0Rk41H)

## Review

### Related Terms

- Anabolism: The process by which simpler substances are converted into complex materials within living organisms.
- Catabolism: The breakdown of complex molecules in living organisms to form simpler ones along with releasing energy; destructive metabolism.
- Enzyme Catalysts: Substances that increase the speed at which metabolic pathways occur.