4 A2/A-level resources Search within results Go How ratings and recommendations work Apply Filter resourcesClear all filtersLevelClear filter A2/A-level Subject Biology Exam board OCR TopicClear filter Genomes and Gene Technology Resources Grid Timeline Gene Transfer A2/A-level, Biology Grid Producing Human Insulin from Bacteria A2/A-level, Biology Grid Electrophoresis A2/A-level, Biology Grid PCR (Polymerase Chain Reaction) A2/A-level, Biology Grid Search again