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1. Molecules
1. Molecules
2. Cells
2. Cells
3. Organisms
3. Organisms
4. Ecosystems
4. Ecosystems
A. Unity and Diversity
A. Unity and Diversity
Common ancestry has given living organisms many shared features while evolution has resulted in the rich biodiversity of life on Earth.
A2.1 Origins of Cells
A2.2 Cell Structure
A2.3 Viruses
A3.1 Diversity of Organisms
A3.2 Classification and Cladistics
A4.1 Evolution and Speciation
A4.2 Conservation of Biodiversity
B. form and Function
B. form and Function
Adaptations are forms that correspond to function. These adaptations persist from generation to generation because they increase the chances of survival.
B1.2 Proteins
B2.1 Membranes and membrane transport
B2.2 Organelles and Compartmentalisation
B2.3 Cell Specialisation
B3.1 Gas Exchange
B3.2 Transport
B3.3 Muscles and Motility (HL only)
B4.1 Adaptation to Environment
B4.2 Ecological Niche
C. Interaction and Interdependence
C. Interaction and Interdependence
Systems are based on interactions, interdependence and integration of components. Systems result in emergence of new properties at each level of biological organization.
C1.1 Enzymes and Metabolism
C1.2 Cell Respiration
C1.3 Photosynthesis
C2.1 Chemical Signalling (HL Only)
C2.2 Neural Signalling
C3.1 Integration of Body Systems
C3.2 Defence against disease
C4.1 Populations and Communities
C4.2 Transfer of Energy and Matter
D. Continuity and Change
D. Continuity and Change
Living things have mechanisms for maintaining equilibrium and for bringing about transformation. Environmental change is a driver of evolution by natural selection.
D1.1 DNA Replication
D1.2 Protein Synthesis
D1.3 Mutation and Gene Editing
D2.1 Cell and Nuclear Division
D2.2 Gene Expression (HL Only)
D2.3 Water Potential
D3.1 Reproduction
D3.2 Inheritance
D3.3 Homeostasis
D4.1 Natural Selection
B4.2 Stability and Change
B4.3 Climate Change
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