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A Unity and diversity

A.1 Unity and diversity—Molecules

A.1.2 Nucleic acids

A.2 Unity and diversity—Cells

A.2.1 Origins of cells

A.2.2 Cell structure

A.3 Unity and diversity—Organisms

A.3.1 Diversity of organisms

A.3.2 Classification and cladistics

A.4 Unity and diversity—Ecosystems

A.4.1 Evolution and speciation

A.4.2 Conservation of biodiversity

B Form and function

B.1 Form and function—Molecules

B.1.1 Carbohydrates and lipids

B.2 Form and function—Cells

B.2.1 Membranes and membrane transport

B.2.2 Organelles and compartmentalization

B.2.3 Cell specialization

B.3 Form and function—Organisms

B.3.1 Gas exchange

B.3.2 Transport

B.3.3 Muscle and motility

B.4 Form and function—Ecosystems

B.4.2 Ecological niches

C Interaction and interdependence

C.1 Interaction and interdependence—Molecules

C.1.1 Enzymes and metabolism

C.1.2 Cell respiration

C.1.3 Photosynthesis

C.2 Interaction and interdependence—Cells

C.2.1 Chemical signalling

C.2.2 Neural signalling

C.3 Interaction and interdependence—Organisms

C.3.1 Integration of body systems

C.3.2 Defence against disease

C.4 Interaction and interdependence—Ecosystems

C.4.1 Populations and communities

C.4.2 Ecosystems

D Continuity and change

D.1 Continuity and change—Molecules

D.1.1 DNA replication

D.1.2 Protein synthesis

D.1.3 Mutation and gene editing

D.2 Continuity and change—Cells

D.2.1 Cell and nuclear division

D.2.2 Gene expression

D.2.3 Water potential

D.3 Continuity and change—Organisms

D.3.1 Reproduction

D.3.2 Inheritance

D.3.3 Homeostasis

D.4 Continuity and change—Ecosystems

D.4.1 Natural selection

D.4.2 Stability and change

D.4.3 Climate change

International Baccalaureate IB Biology

A Unity and diversity

A.1 Unity and diversity—Molecules

A.1.2 Nucleic acids

A.2 Unity and diversity—Cells

A.2.1 Origins of cells

A.2.2 Cell structure

A.3 Unity and diversity—Organisms

A.3.1 Diversity of organisms

A.3.2 Classification and cladistics

A.4 Unity and diversity—Ecosystems

A.4.1 Evolution and speciation

A.4.2 Conservation of biodiversity

B Form and function

B.1 Form and function—Molecules

B.1.1 Carbohydrates and lipids

B.2 Form and function—Cells

B.2.1 Membranes and membrane transport

B.2.2 Organelles and compartmentalization

B.2.3 Cell specialization

B.3 Form and function—Organisms

B.3.1 Gas exchange

B.3.2 Transport

B.3.3 Muscle and motility

B.4 Form and function—Ecosystems

B.4.2 Ecological niches

C Interaction and interdependence

C.1 Interaction and interdependence—Molecules

C.1.1 Enzymes and metabolism

C.1.2 Cell respiration

C.1.3 Photosynthesis

C.2 Interaction and interdependence—Cells

C.2.1 Chemical signalling

C.2.2 Neural signalling

C.3 Interaction and interdependence—Organisms

C.3.1 Integration of body systems

C.3.2 Defence against disease

C.4 Interaction and interdependence—Ecosystems

C.4.1 Populations and communities

C.4.2 Ecosystems

D Continuity and change

D.1 Continuity and change—Molecules

D.1.1 DNA replication

D.1.2 Protein synthesis

D.1.3 Mutation and gene editing

D.2 Continuity and change—Cells

D.2.1 Cell and nuclear division

D.2.2 Gene expression

D.2.3 Water potential

D.3 Continuity and change—Organisms

D.3.1 Reproduction

D.3.2 Inheritance

D.3.3 Homeostasis

D.4 Continuity and change—Ecosystems

D.4.1 Natural selection

D.4.2 Stability and change

D.4.3 Climate change

B.1.1 Carbohydrates and lipids

B.1.2 Proteins

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