Fully updated for the current Biology for CCEA AS Level specification and endorsed by CCEA. It has been subject to a detailed quality assurance process by an independent Biology expert. It contains new colour-coded practical work sections to address the AS3 paper and provides sample examination questions for each topic.Illustrated in full colour with bright and clear presentation.The author, Dr James Napier, is a well-known Biology author who, prior to his recent retirement, was vice-principal in a Northern Ireland grammar school.Contents: AS 1 Molecules and Cells Chapter 1 MoleculesChapter 2 EnzymesChapter 3 CellsChapter 4 Cell PhysiologyChapter 5 Continuity of CellsChapter 6 Tissues and Organs AS 2 Organisms and Biodiversity Chapter 7 The Principals of Exchange and TransportChapter 8 Transport in Plants and TranspirationChapter 9 Circulatory Systems in MammalsChapter 10 The Adaptation of OrganismsChapter 11 BiodiversityChapter 12 Human Impact on Biodiversity