OCR A Depth and Breath in Biology. Paper 1, 2, 3. Module 2, 3, 4, 5, 6. OCRA A Level Modules and OCRA Biology AS Module 2.2 Basic components of living systems, 2.3 Biological molecules, 2.4 Enzymes, 2.5 Cell division, 2.6 Cell division, Module 3 3.1 Exchange and Transport, 3.2 Transport in animals, 3.3 Transport in plants, Module 4, 4.2 Biodiversity, Module 5, 5.1 Neuronal communication, 5.3 Excretion and homeostasis, Module 6 6.1 Genetics of living systems, 6.2 Patterns of inheritance