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• Contents Introduction Theme A—Unity and diversity A1.1 Water A1.2 Nucleic acids 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 Theme B—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 B4.1 Adaptation to environment B4.2 Ecological niches Theme C—Interaction and interdependence C1.1 Enzymes and metabolism C1.2 Cell respiration C1.3 Photosynthesis C2.1 Chemical signalling 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 Theme D—Continuity and change D1.1 DNA replication D1.2 Protein synthesis D1.3 Mutation and gene editing D2.1 Cell and nuclear division D2.2 Gene expression 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 Internal Assessment Practice Exam Papers Index

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• Contents Introduction Theme A—Unity and diversity A1.1 Water A1.2 Nucleic acids 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 Theme B—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 B4.1 Adaptation to environment B4.2 Ecological niches Theme C—Interaction and interdependence C1.1 Enzymes and metabolism C1.2 Cell respiration C1.3 Photosynthesis C2.1 Chemical signalling 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 Theme D—Continuity and change D1.1 DNA replication D1.2 Protein synthesis D1.3 Mutation and gene editing D2.1 Cell and nuclear division D2.2 Gene expression 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 Internal Assessment Practice Exam Papers Index

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• Contents Introduction Theme A—Unity and diversity A1.1 Water A1.2 Nucleic acids 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 Theme B—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 B4.1 Adaptation to environment B4.2 Ecological niches Theme C—Interaction and interdependence C1.1 Enzymes and metabolism C1.2 Cell respiration C1.3 Photosynthesis C2.1 Chemical signalling 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 Theme D—Continuity and change D1.1 DNA replication D1.2 Protein synthesis D1.3 Mutation and gene editing D2.1 Cell and nuclear division D2.2 Gene expression 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 Internal Assessment Practice Exam Papers Index