WJEC Biology for AS: Study and Rev Guide

Contents How to use this book 4 Knowledge and Understanding 4 U nit 1 Basic Biochemistry and Cell Organisation 6 1.1 Chemical elements and biological compounds 8 1.2 Cell structure and organisation 22 1.3 Cell membranes and transport 32 1.4 Enzymes and biological reactions 41 1.5 Nucleic acids and their functions 51 1.6 The cell cycle and cell division 59 U nit 2 Biodiversity and Physiology of Body Systems 68 2.1 Classification and biodiversity 70 2.2 Adaptations for gas exchange 78 2.3a Adaptations for transport in animals 86 2.3b Adaptations for transport in plants 95 2.4 Adaptations for nutrition 104 Exam preparation 118 Exam practice and technique 118 Questions and answers 128 Additional practice questions 145 Answers 148 Quickfire answers 148 Additional practice questions answers 150 Index 154