International Baccalaureate IB Diploma Programme Biology
Syllabus DP Biology · First assessment 2025 · sourced from International Baccalaureate Organization, Biology guide (Diploma Programme), first assessment 2025, verified 2026-09-17.
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1. Unity and diversity
- A1.1 Water
- A1.2 Nucleic acids
- A2.1 Origins of cells (HL only)
- A2.2 Cell structure
- A2.3 Viruses (HL only)
- A3.1 Diversity of organisms
- A3.2 Classification and cladistics (HL only)
- A4.1 Evolution and speciation
- A4.2 Conservation of biodiversity
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2. Form and function
- B1.1 Carbohydrates and lipids
- B1.2 Proteins
- B2.1 Membranes and membrane transport
- B2.2 Organelles and compartmentalization
- B2.3 Cell specialization
- B3.1 Gas exchange
- B3.2 Transport
- B3.3 Muscle and motility (HL only)
- B4.1 Adaptation to environment
- B4.2 Ecological niches
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3. Interaction and interdependence
- 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 Transfers of energy and matter
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4. Continuity and change
- D1.1 DNA replication
- D1.2 Protein synthesis
- D1.3 Mutations 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
- D4.2 Stability and change
- D4.3 Climate change