🧬ap biology review

Glycogen

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

Glycogen is a polysaccharide that serves as the primary form of energy storage in animals and fungi. It's similar to starch but has more extensive branching.