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A-level Biology

This is another of the series of A-level wikibooks. This book is based on the OCR and AQA A-Level Biology specifications, but is not endorsed by either exam board. It should be useful as a revision guide or to find alternative explanations to the ones in your textbook.

This book assumes that you have completed GCSE science. If there are problems with this book, in clarity or a conflict with the syllabus, please feel free to post on the discussion page or to edit it. Useful Assessment Statements for AS&A2 Biology can be found in the IB Biology page.




A2 (optional modules)



  • Unit 3 (BIOL3)


  • Unit 4 (BIOL4)
  • Unit 5 (BIOL5)
  • Unit 6 (BIOL6)