1. Biological molecules1.3 Enzymes0/01.2 Nucleotides and nucleic acids0/01.1 Biological molecules0/01. Biological molecules1.3 Enzymes0/01.2 Nucleotides and nucleic acids0/01.1 Biological molecules0/02. CellsPremium2.1 Cell structure0/02.2 Biological membranes0/02.3 Cell division, cell diversity and cellular organisation0/02. CellsPremium2.1 Cell structure0/02.2 Biological membranes0/02.3 Cell division, cell diversity and cellular organisation0/03. Organisms exchange substances with their environmentPremium3.1 Exchange surfaces0/03.2 Transport in animals0/03.3 Transport in plants0/03. Organisms exchange substances with their environmentPremium3.1 Exchange surfaces0/03.2 Transport in animals0/03.3 Transport in plants0/04. Genetic information, variation and relationships between organismsPremium4.2 Patterns of inheritance0/04.1 Classification and evolution0/04. Genetic information, variation and relationships between organismsPremium4.2 Patterns of inheritance0/04.1 Classification and evolution0/05. Energy transfers in and between organisms (A-level only)5.1 Photosynthesis0/05.2 Respiration0/05. Energy transfers in and between organisms (A-level only)5.1 Photosynthesis0/05.2 Respiration0/06. Organisms respond to changes in their internal and external environments (A-level only)Premium6.1 Communication and homeostasis0/06.2 Excretion as an example of homeostatic control0/06.4 Hormonal communication0/06.5 Plant and animal responses0/06.3 Neuronal communication0/06. Organisms respond to changes in their internal and external environments (A-level only)Premium6.1 Communication and homeostasis0/06.2 Excretion as an example of homeostatic control0/06.4 Hormonal communication0/06.5 Plant and animal responses0/06.3 Neuronal communication0/07. Genetics, populations, evolution and ecosystems (A-level only)Premium7.2 Biodiversity0/07.3 Ecosystems0/07.1 Communicable diseases, disease prevention and the immune system0/07.4 Populations and sustainability0/07. Genetics, populations, evolution and ecosystems (A-level only)Premium7.2 Biodiversity0/07.3 Ecosystems0/07.1 Communicable diseases, disease prevention and the immune system0/07.4 Populations and sustainability0/08. The control of gene expression (A-level only)Premium8.1 Cellular control0/08.2 Manipulating genomes0/08. The control of gene expression (A-level only)Premium8.1 Cellular control0/08.2 Manipulating genomes0/0