Random Walker
  • Unit 1 — Biological Molecules
    • Protein Properties
    • Structure of DNA & RNA
    • ATP
    • DNA Replication
  • Unit 2 — Cells
    • Eukaryotic Cell Structure
    • Prokaryotic Cells & Viruses
    • Methods of Studying Cells
    • All Cells Arise from Other Cells
    • Transport Across Cell Membranes
    • Cell Recognition & Immune System
    • HIV
    • Monoclonal Antibodies & ELISA
  • Unit 3 — Exchange & Transport
    • Surface Area to Volume Ratio
    • Gas Exchange
    • Digestion and Absorption
    • Mass Transport in Animals
    • Mass Transport in Plants — Xylem
    • Mass Transport in Plants — Phloem
  • Unit 4 — Genetics
    • DNA Genes & Chromosomes
    • DNA and Protein Synthesis
    • Genetic Diversity: Mutation and Meiosis
    • Genetic Diversity and Adaptation
  • Unit 5 — Energy & Ecosystems
    • Photosynthesis
    • Chromatography
    • Dehydrogenase
    • Respiration
    • Nutrient Cycles
    • Energy & Ecosystems
  • Unit 6 — Respond to Changes
    • Principles of Homeostasis
    • Nerve Impulses
    • Synaptic Transmission
    • Skeletal muscles
    • Kidneys
    • Control of Blood Glucose
  • Unit 8 — Gene Expression
    • Unit 8 Overview
    • Gene Mutations
    • Stem Cells
    • Regulation Transcription & Translation
    • Cancer
    • Genome Projects
    • Recombinant DNA
    • DNA Probes
    • Genetic Fingerprinting
  • Interactive Simulations
    • Mutations
    • Synapse Drug Effects
    • Transport Across Membranes
    • Blood Glucose Regulation
    • O₂ Dissociation Curve
    • Tissue Fluid
    • Cardiac Cycle
    • Cohesion-Tension
    • Mass Flow Hypothesis
    • Transcription
  • Exam Skills
    • Essay Guidance
  • Exam Insights
  • Images & Animations
  • Flashcards
  • Mind Maps
  • Slide Decks

Random Walker

Hello! I’m a Biology tutor and previous teacher. I built this site as I wanted one place to share and organise all my resources I use with my students.

It’s a work in progress — it doesn’t cover every topic yet and currently only has AQA A level Biology course.

AQA A-Level Biology

These resources follow the AQA A-Level Biology specification (7402).

Notes

Designed with embedded images and animations to help your understanding

Simulations

Interactive simulations to explore biological processes

Images & Animations

Filter by topic and use flashcard mode to practise identifying what each image shows

Flashcards

Flashcards

Topic-by-topic recall practice — built from the spec, past papers, and examiner reports

Exam Insights

Exam Insights

Analysis of past paper data from 2017 to 2024

Mind Maps

Mind Maps

Interactive revision mind maps for each unit, with zoom, fullscreen, and print

Graph View

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