AP Biology Unit 2: Cell Structure and Function

Unit 2: Cell Structure and Function Unit 2 is the structural backbone of AP Biology. Everything you learn later — metabolism (Unit 3), cell communication (Unit 4), the cell cycle (Unit 4), gene expression (Unit 6) — happens inside or across the structures you study here. If you don't understand compartmentalization and membranes, nothing downstream will make sense. This guide walks through the College Board's six topics for Unit 2: cell structures, cell size, subcellular components, endosymbiotic theory, membrane structure, and membrane transport (including tonicity and water potential). --- 2…