A - Unity and Diversity
A1.1 Water
A1.2 Nucleic acids
A2.1 Origins of cells (HL)
A2.2 Cell structure
A2.3 Viruses (HL)
A3.1 Diversity of organisms
A3.2 Classification and cladistics (HL)
A4.1 Evolution and speciation
A4.2 Conservation of biodiversity
B - Form and Function
C - Interaction and Interdependence
D - Continuity and Change
View a summary cheatsheet for A2.1 Origins of cells (HL)
A2.1.1 Conditions on early Earth and the pre-biotic formation of carbon compounds (HL only)
A2.1.2 Cells as the smallest units of self-sustaining life (HL only)
A2.1.3 Challenge of explaining the spontaneous origin of cells
A2.1.4 Evidence for the origin of carbon compounds
A2.1.5 Spontaneous formation of vesicles by coalescence of fatty acids into spherical bilayers
A2.1.6 RNA as a presumed first genetic material
A2.1.7 Evidence for a last universal common ancestor
A2.1.8 Approaches used to estimate dates of the first living cells
A2.1.9 Evidence for the evolution of the last universal common ancestor
