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🧬ap biology review

Ligand in AP Biology

Verified for the 2027 exam
Verified for the 2027 exam•Fiveable Content Team

Definition

A ligand is a molecule that binds to another (usually larger) molecule. In cell communication, it's often the signal molecule that binds to a receptor.

This definition is part of Fiveable's AP Biology review, which also has guided practice questions.