This important new resource has been written to cover the revised CCEA AS level Biology specification and is endorsed by CCEA. Following the same content as the specification, the resource is presented in full colour with over two hundred illustrations. This bright and clear layout will aid students' understanding of the course. Sample examination questions are also provided throughout to reinforce learning and aid preparation for the exam. The author, Dr James Napier, is a well-known Biology author and a former Vice-Principal in a large Northern Ireland Grammar School. AS1 Molecules and Cells Chapter 1 - Molecules Chapter 2 - Enzymes Chapter 3 - Cells Chapter 4 - Cell Physiology Chapter 5 - Nucleic Acids and DNA Technology Chapter 6 - Continuity of Cells Chapter 7 - Tissues and Organs AS2 Organisms and Biodiversity Chapter 8 - The Principles of Exchange and Transport Chapter 9 - Transport in Plants and Transpiration Chapter 10 - Circulatory Systems in Mammals Chapter 11 - The Adaptation of Organisms Chapter 12 - The Variety of Life Chapter 13 - Human Impact on Biodiversity