Written by AQA examiners, this is a revised and updated edition of Collins Student Support Materials for AQA A2 Biology. It fully supports the new 2008 AQA Biology specification for Unit 5. All the knowledge you need is summarised so you can use it as a study guide or revision guide to ensure success in your exam. This book provides a clear and easy path to learning all the essential information in the new 2008 AQA Biology A2 specification for Unit 5: Control in Cells and in Organisms. It is the perfect way to support your studies and an excellent revision guide. It includes: -How Science Works guidance to help tackle this new key focus in the specification -Examiner's Notes boxes to give advice on exam technique and warn of common misconceptions -Essential Notes boxes to highlight crucial information -Definition boxes and a comprehensive glossary to help memorise essential terminology -Practice questions to help prepare for exams -An index for quick reference