AQA A-Level Biology Revision Guide

If you’re studying AQA A-level Biology and starting to think seriously about exams, don’t panic! This guide breaks down how many papers there are, what each exam looks like and how to revise effectively so you can walk in feeling confident 💪

📑 How Many Papers Are There?

• There are three exam papers in AQA A level Biology:

👉Paper 1

👉Paper 2

👉Paper 3

All three papers are sat at the end of Year 13 and all count equally towards your final grade.

📑 Paper 1 and Paper 2

• ⏰Duration of both papers: 1 hour 30 minutes 




• 🏆Marks in both papers: 75 marks (each paper worth 50% of total grade)




• 📌Content:  The AS course content is drawn from four key topic areas of the specification. You’ll be tested on any of these in both exams: 

🧪 Topic 1: Biological Molecules

• Monomers and polymers

• Carbohydrates 

• Lipids

• Proteins (structure, bonds, enzymes)

• Enzyme action and factors affecting enzymes

• DNA, RNA and ATP

• Water and inorganic ions

🔬 Topic 2: Cells

• Cell theory

• Eukaryotic and prokaryotic cells

• Cell ultrastructure

• Microscopy (light and electron microscopes)

• Cell membrane structure

• Transport across membranes (diffusion, osmosis, active transport)

• Cell recognition and the immune response (phagocytosis)

• Cell cycle and mitosis

🌬️ Topic 3: Organisms Exchange Substances with Their Environment

• Surface area to volume ratio

• Gas exchange in single-celled organisms, insects, fish and mammals

• Structure and function of the lungs

• Digestion and absorption

• Mass transport in plants (xylem and phloem)

• Mass transport in animals (heart, blood vessels, blood)

🧬 Topic 4: Genetic Information, Variation and Relationships

• DNA structure and replication

• Protein synthesis (transcription and translation)

• Mutations

• Meiosis and genetic diversity

• Genetic inheritance

• Variation (genetic and environmental)

• Classification and phylogeny

• Biodiversity and adaptations

🔬 Practical Skills (Assessed in BOTH papers)

There is no separate practical exam, but practical knowledge is tested throughout both papers 🧠

You should be confident with:

• Required practicals (aims, methods, variables, risks)

• Data analysis (tables, graphs, calculations)

• Drawing conclusions and evaluating experiments

• Using correct units and scientific terminology

🧮 Maths in Biology

You’ll also be expected to apply maths skills (at least 10% of marks), including:

• Calculations (rates, percentages, concentrations)

• Graph plotting and interpretation

• Using equations (e.g., for pH or enzyme kinetics)

• ❓Question Types: These are in BOTH papers.

✅Multiple-choice questions

Test key knowledge, definitions and simple application.

✍️Short answer questions 
Definitions, descriptions, explanations and recall.

📊Data analysis and interpretation 
Interpreting graphs, tables and trends, plus calculations.

🧪Practical-based questions 
Required practicals, variables, methods, errors and evaluation.

🧮Maths and calculations 
Percentages, rates, equations, graph skills and correct units.

✍️Longer answer questions 
Explain processes clearly, link ideas and apply knowledge.

📑 Paper 1

• ⏰Duration: 2 hours




• 🏆Marks: 91 marks (35% if total grade)




• 📌Content: This paper covers topics 1-4 of the specification.

🧪 Topic 1: Biological Molecules

• Monomers and polymers

• Carbohydrates 

• Lipids 

• Proteins (structure, bonds, enzymes)

• Enzyme action and factors affecting enzymes

• DNA, RNA and ATP

• Water and inorganic ions

🔬 Topic 2: Cells

• Cell theory

• Eukaryotic and prokaryotic cells

• Cell ultrastructure

• Microscopy (light and electron microscopes)

• Cell membrane structure

• Transport across membranes (diffusion, osmosis, active transport)

• Cell recognition and the immune response (phagocytosis)

• Cell cycle and mitosis

🌬️ Topic 3: Organisms Exchange Substances with Their Environment

• Surface area to volume ratio

• Gas exchange in single-celled organisms, insects, fish and mammals

• Structure and function of the lungs

• Digestion and absorption

• Mass transport in plants (xylem and phloem)

• Mass transport in animals (heart, blood vessels, blood)

🧬 Topic 4: Genetic Information, Variation and Relationships

• DNA structure and replication

• Protein synthesis (transcription and translation)

• Mutations

• Meiosis and genetic diversity

• Genetic inheritance

• Variation (genetic and environmental)

• Classification and phylogeny

• Biodiversity and adaptations

• ❓Question Types: In this paper, there is a focus on knowledge, application and data interpretation.

• ✅ Multiple choice questions

• ✍️ Short answer questions 

• 🧠 Explain / Describe questions

• 📊 Data analysis questions: Interpreting graphs, tables and diagrams

• 📈 Calculations: e.g. percentages, rates, magnification

  🧪 Practical-based questions: Methods, variables, risk assessments, improvements
  
  
  

💡 Expect lots of questions where you must apply your knowledge to unfamiliar biological contexts.

📑 Paper 2

• ⏰Duration: 2 hours




• 🏆Marks: 91 marks (35% of total grade)




• 📌Content: This paper covers topics 5-8 of the specification.

🌱 Topic 5: Energy Transfers in and Between Organisms

• Photosynthesis (light-dependent and light-independent reactions)

• Limiting factors

• Respiration (aerobic and anaerobic)

• Energy flow through ecosystems

• Nutrient Cycle

⚡ Topic 6: Organisms Respond to Changes in Their Environments

• Nervous coordination

• Structure of neurones and synapses

• Muscle contraction

• Hormonal communication

• Homeostasis

• Control of blood glucose

• Receptors

• Control of heart rate

🌍 Topic 7: Genetics, Populations, Evolution and Ecosystems

• Inheritence

• Populations

• Evolution and speciation

• Ecosystems and populations

• Conservation of biodiversity

🧬 Topic 8: The Control of Gene Expression

• Regulation of transcription and translation

• Epigenetics

• Gene mutations

• Gene technologies (PCR, gel electrophoresis, sequencing)

• Genetic engineering

• Stem cells

• Gene therapy

• Genome projects

• ❓Question Types: these questions will demonstrate a deeper understanding.

• ✅ Multiple choice questions

• ✍️ Short and medium answer questions

• 🧠 Extended response questions 

• 📊 Data and graph analysis

• 🧮 Mathematical questions - e.g. standard deviation, percentages, rate calculations

• 🧪 Practical-based questions - applying practical skills to new scenarios

  
  

💡 Paper 2 often tests processes and sequences, so clear explanations are key 🔑

📑 Paper 3

• ⏰Duration: 2 hours




• 🏆Marks: 78 marks (30% of total grade)




• 📌Content: This paper covers topics 1-8 from the specification.

What’s assessed:

• Content from the entire specification

• Required practicals and experimental techniques

• Data analysis and interpretation

• Graphs, calculations and experimental design

• A 25-mark synoptic essay

🧠 This paper is about linking ideas across topics and applying biology in unfamiliar contexts.

• ❓Question Types: The focus is on practical skills, analysis and linking ideas across the entire course.

• 🧪 Practical-focused questions

• Required practicals

• Experimental design

• Variables, controls, errors and improvements

• 📊 Data handling and interpretation

• Large data sets

• Unfamiliar experiments

• 📈 Graphs and calculations

• 🧠 Synoptic questions

• Linking multiple topics together

• ✍️ 25-mark essay

  • Choice of titles

  • Requires breadth, depth and clear structure

💡 Paper 3 rewards students who can think like a biologist, not just recall facts.