This book aims to introduce the reader to Biology at an advanced level and to be used in addition to the text book I am sure you already own. I think that conventional textbooks embed the principles too deeply in the text and that these principles are the key to understanding Biology and to success in exams - which is what all students want. This book explains Biology in the form of a series of questions and answers: such as 'What is the function of DNA?'; answer: 'It contains genes that code for the production of proteins and is the molecule of inheritance.' The book also contains exam questions and answers - with hints and tips from me as to how to interpret and answer the questions. Each chapter begins with a glossary so you understand the terms and words BEFORE you read the chapter. My hope is that you will find the book really useful and it will improve and deepen your understanding of Biology.