1. Molecules, Transport & Health

Biological Molecules

The Importance of Water

Saccharides

Core Practical 1: Estimating the Concentration of Sugars & Starch

Condensation & Hydrolysis

Triglycerides & Ester Bonds

The Circulatory System

The Need for a Circulatory System

Blood Vessels: Structure & Function

The Cardiac Cycle

The Role of Haemoglobin

Atherosclerosis

Blood Clotting

Diet & Health

Reducing Risk Factors of CVD

Dietary Antioxidants & CVD

Core Practical 2: Investigate the Vitamin C Content of Food & Drink

Interpreting Data on Risk Factors

Designing Studies into the Effects of Risk Factors

Perception of Risk vs Actual Risk

Data on Cholesterol & Lipoproteins

Data on Effect of Diet

Treatments for CVD - Benefits & Risks

2. Membranes, Proteins, DNA & Gene Expression

Gas Exchange, Cell Membranes & Transport

Properties of Gas Exchange Surfaces

Cell Membranes

Core Practical 3: Investigating Membrane Structure & Permeability

Osmosis

Diffusion, Facilitated Diffusion & Active Transport

Proteins

Amino Acids, Proteins & Protein Structure

Enzymes - Roles & Modes of Action

Core Practical 4: Investigating the Rate of Enzyme Reactions

Nucleotides, DNA & RNA, Base Pairing

DNA & Gene Expression

DNA Replication

The Nature of the Genetic Code

How Bases Code for a Polypeptide Chain

Transcription & Translation

Inheritance

Mutations

Patterns of Inheritance & Sex Linkage

Cystic Fibrosis

Genetic Screening

Ethical & Social Issues of Genetic Screening

3. Cell Structure, Reproduction & Development

Cell Structure & Organisation

Cell Theory

Levels of Organisation of Cells

Eukaryotic Cells

The Rough Endoplasmic Reticulum & Golgi

Prokaryotic Cells

Electron Microscopy of Animal Cells

Microscopy: Magnification & Resolution

Core Practical 5 - Light Microscopy

Reproduction & Inheritance

Gene Locus

Meiosis & Variation

Mammalian Gametes

Fertilisation - Mammals

Fertilisation - Flowering Plants

The Cell Cycle & Mitosis

Core Practical 6: Observing the Stages of Mitosis

Calculation of Mitotic Index

Stem Cells & Cell Potency

Cell Specialisation

Post-Transcriptional Changes to mRNA

Gene Interaction & Epigenetics

Polygenic Inheritance & Continuous Variation

4. Plant Structure & Function, Biodiversity & Conservation

Plant Structure & Function

Plant Cell Structure

Electron Microscopy of Plant Cells

Starch & Cellulose: Structure & Function

Properties of Cellulose

The Vascular Structure of Plants

Core Practical 7: Identifying Tissue Types Within Stems

Plants & Conservation

Plant-Based Products for Sustainability

Water & Inorganic Ions in Plants

Core Practical 8: Determining the Tensile Strength of Plant Fibres

Plants & Bacterial Growth

Bacterial Growth Conditions

Plant Products with Antimicrobial Properties

Core Practical 9: Antimicrobial Properties of Plants

Development of Drugs & Drug Testing

Classification & Biodiversity

The Three Domains of Life

The Variety of Life

Biodiversity & Endemism

Species Richness & Heterozygosity Index

Index of Biodiversity

Ecological Niches & Adaptations

Hardy-Weinberg Equation

Roles of Seed Banks & Zoos in Conservation

Study tools

• Edexcel International AS Biology · Exam Questions
• Edexcel International AS Biology · Past Papers

Related links

• International AS Biology · Revision Notes
• International AS Biology · Exam Questions
• International AS Biology · Past Papers
• Edexcel International AS Biology · Exam specification