Unit 4.1 Cell biology (paper 1 and 2)
Unit 4.2 Organisation (paper 1)
Unit 4.3 Infection and response (paper 1)
Unit 4.4 Bioenergetics (paper 1)
Unit 4.5 Homeostasis and response (paper 2)
Unit 4.6 Inheritance, variation and evolution (paper 2)
Unit 4.7 Ecology (paper 2)