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A-Level Biology Revision Notes

Complete revision notes covering all A-Level Biology topics with detailed diagrams, processes, and applications.

32+ Topic Guides
All Free Downloadable PDFs
AS & A2 Full Coverage
AS

Biological Molecules

Carbohydrates, lipids, proteins, and nucleic acids.

What's Included:
  • Water & Hydrogen Bonding
  • Carbohydrates
  • Lipids
  • Proteins & Enzymes
  • DNA & RNA
14 pages 35 min read
AS

Cells & Cell Division

Cell structure, membranes, and division processes.

What's Included:
  • Cell Structure & Function
  • Cell Membranes
  • Transport Across Membranes
  • Mitosis & Meiosis
  • Cell Cycle Regulation
12 pages 30 min read
AS

Exchange & Transport

Gas exchange and transport systems in organisms.

What's Included:
  • Surface Area to Volume Ratio
  • Gas Exchange in Humans
  • Gas Exchange in Plants
  • Transport in Animals
  • Transport in Plants
11 pages 28 min read
A2

Genetic Information & Protein Synthesis

DNA structure, replication, and gene expression.

What's Included:
  • DNA Structure & Replication
  • Genes & Chromosomes
  • Protein Synthesis
  • Gene Expression
  • Mutations
13 pages 32 min read
A2

Energy & Respiration

Cellular respiration and ATP production.

What's Included:
  • ATP Structure & Function
  • Glycolysis
  • Krebs Cycle
  • Oxidative Phosphorylation
  • Anaerobic Respiration
12 pages 30 min read
A2

Photosynthesis

Light-dependent and independent reactions.

What's Included:
  • Photosynthesis Overview
  • Light-Dependent Reaction
  • Calvin Cycle
  • Limiting Factors
  • Chloroplast Structure
11 pages 28 min read
A2

Genetics & Evolution

Inheritance patterns and gene technology.

What's Included:
  • Monohybrid & Dihybrid Crosses
  • Codominance & Multiple Alleles
  • Sex Linkage
  • Chi-Squared Test
  • Gene Technology
14 pages 35 min read
A2

Populations & Ecosystems

Ecology, populations, and succession.

What's Included:
  • Populations & Communities
  • Energy Transfer
  • Nutrient Cycles
  • Succession
  • Conservation
10 pages 25 min read

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