Icon for AP® Biology

AP® Biology

functions of macromolecules

Functions of Macromolecules: AP® Biology Review

Introduction Macromolecules—carbohydrates, proteins, nucleic acids, and lipids—are indispensable to life. They form the structural framework of cells, provide energy, store genetic instructions, and much more.

structure of water

Structure of Water: AP® Biology Review

Introduction Water is essential for life on Earth. From regulating our body temperature to dissolving vital nutrients, water’s unique properties are at the heart of

AP® Biology practice test

AP® Biology Practice Tests

If you’re looking for some of the best AP® Biology practice questions, you’ve come to the right place. In this post, we break down question sets based on Big Ideas and Enduring Understandings.