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AS Edexcel Biology Textbook

Concise resources for the Edexcel AS Biology Course

 

INDEX – Topic 1: Molecules, Transport and Health

1A. Chemistry for Biologists

  1. The Chemistry of Life
  2. Carbohydrates 1: Monosaccharides and Disaccharides
  3. Carbohydrates 2: Polysaccharides
  4. Lipids
  5. Proteins
  6. Thinking Bigger: Trehalose
  7. Exam Practice

 

 

INDEX – Topic 2: Membranes, Proteins, DNA and Gene Expression

2A. Membranes and Transport

  1. Cell Membranes
  2. Cell Transport and Diffusion
  3. Osmosis: A Special Case of Diffusion
  4. Active Transport
  5. The Need for Gas Exchange Surfaces
  6. The Mammalian Gas Exchange System
  7. Thinking Bigger: Asthma and Air Pollution
  8. Exam Practice
 

2B. Proteins and DNA

  1. Enzymes
  2. How Enzymes Work
  3. The Structure of DNA and RNA
  4. How DNA Works
  5. The Genetic Code
  6. DNA and Protein Synthesis
  7. Thinking Bigger: Raw Enzymes
  8. Exam Practice
 

2C. Gene Expression and Genetics

  1. Gene Mutation
  2. Patterns of Inheritance
  3. Sex Linkage
  4. Cystic Fibrosis: A Genetic Disease
  5. Genetic Screening
  6. Exam Practice
 
 
 
 

3B. Mitosis, Meiosis and Reproduction

  1. The Cell Cycle
  2. Mitosis
  3. Sexual Reproduction and Meiosis
  4. Gametes: Structure and Function
  5. Fertilisation in Mammals and Plants
  6. Thinking Bigger: Male Infertility
  7. Exam Practice
 

INDEX – Topic 4: Plant Structure and Function, Biodiversity and Conservation

4A. Plant Structure and Function

  1. The Cell Wall
  2. Plant Organelles
  3. Plant Stems
  4. The Importance of Water and Minerals in Plants
  5. Using Plant Starch and Fibres
  6. Plant-Based Medicines
  7. Developing New Drugs
  8. Exam Practice
 

4B. Classification

  1. Principles of Classification
  2. What Is a Species?
  3. Domains, Kingdoms or Both?
  4. Thinking Bigger: The Quagga
  5. Exam Practice
 

4C. Biodiversity and Conservation

  1. Biodiversity and Endemism
  2. Measuring Biodiversity
  3. Adaptation to a Niche
  4. Gene Pool and Genetic Diversity
  5. Reproductive Isolation and Speciation
  6. Conservation: Why and How?
  7. Thinking Bigger: Orang-utans
  8. Exam Practice

Maths Skills

Preparing For Exam

Command Words

Glossary

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