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AP Biology
From the chemistry of life to ecosystems — explore a clickable cell and a rotating DNA double helix you can pull apart.
Unit 1 · 8–11%
Chemistry of Life
- Water & Its Properties12 min · 3 objectives
- Carbohydrates & Lipids13 min · 3 objectives
- Proteins & Enzyme Structure14 min · 3 objectives
- Nucleic Acids: DNA & RNA Structure12 min · 3 objectives
- Water’s Emergent Properties (Depth)14 min · 3 objectives
- Comparing the Four Macromolecules (Depth)14 min · 3 objectives
Unit 2 · 10–13%
Cell Structure & Function
- Prokaryotic vs. Eukaryotic Cells13 min · 3 objectives
- Eukaryotic Organelles14 min · 3 objectives
- The Membrane & Cellular Transport14 min · 3 objectives
- Osmosis, Tonicity & Water Potential13 min · 3 objectives
- Endosymbiotic Theory & the Origin of Eukaryotic Cells14 min · 3 objectives
- Membrane Transport, Quantified15 min · 3 objectives
Unit 3 · 12–16%
Cellular Energetics
Unit 4 · 10–15%
Cell Communication & Cycle
- Cell Signaling & Signal Transduction14 min · 3 objectives
- Feedback Mechanisms & Homeostasis12 min · 3 objectives
- The Cell Cycle & Mitosis14 min · 3 objectives
- Cell Cycle Checkpoints & Cancer13 min · 3 objectives
- Signal Transduction Pathways in Depth15 min · 3 objectives
- Cell-Cycle Control & Cancer14 min · 3 objectives
Unit 5 · 8–11%
Heredity
- Meiosis & Sources of Genetic Variation14 min · 3 objectives
- Mendelian Genetics & Probability15 min · 3 objectives
- Non-Mendelian Inheritance15 min · 3 objectives
- Chromosomal Inheritance & the Environment13 min · 3 objectives
- Dihybrid Crosses & the Chi-Square Test15 min · 3 objectives
- Linkage, Recombination & Gene Mapping14 min · 3 objectives
Unit 6 · 12–16%
Gene Expression & Regulation
- DNA Replication13 min · 3 objectives
- Transcription & RNA Processing13 min · 3 objectives
- Translation & the Genetic Code14 min · 3 objectives
- Mutations & Gene Regulation14 min · 3 objectives
- Biotechnology: PCR, Gels & CRISPR13 min · 3 objectives
- Gene Regulation: Operons & Eukaryotic Control15 min · 3 objectives
- Biotechnology Techniques14 min · 3 objectives
Unit 7 · 13–20%
Natural Selection
- Natural Selection & Fitness14 min · 3 objectives
- Evidence for Evolution13 min · 3 objectives
- Hardy–Weinberg Equilibrium15 min · 3 objectives
- Speciation & Reproductive Isolation13 min · 3 objectives
- Phylogeny, Common Ancestry & Extinction12 min · 3 objectives
- Hardy–Weinberg Problem-Solving15 min · 3 objectives
- Phylogenetics & Cladistics14 min · 3 objectives
Unit 8 · 10–15%
Ecology
- Energy Flow & Trophic Levels13 min · 3 objectives
- Population Growth & Regulation14 min · 3 objectives
- Community Interactions & Succession13 min · 3 objectives
- Biodiversity & Ecosystem Disruption12 min · 3 objectives
- Population Growth Models — Quantitative15 min · 3 objectives
- Community Ecology, Succession & Biodiversity14 min · 3 objectives