About the exam
A-level Biology Exam structure
An independent A-level Biology study guide built from the DfE common content and scientific-skills requirements, cross-checked against current AQA, Pearson Edexcel and OCR specifications.
Issuer and path
A-level Biology Study Guide is administered through England A-level awarding bodies. Check official resources before booking, retesting, or relying on a stale requirement.
England A-level Biology Common Core
0 scored + 0 pretest
The DfE knowledge, practical and mathematical requirements common to regulated AS and A-level Biology specifications in England, organised for study rather than as one board's paper split.
Use your own board's current specification
Check the exact entry code, paper structure, required practical activities, data or formula guidance and any published changes for your cohort. Do not substitute an International A Level or a different Biology route.
Official Outline Coverage Map
Coverage is mapped to official outline item counts so content depth can be checked without hard-coding a single exam.
| Topic | Official outline items | Your questions | Your flashcards | Confidence |
|---|---|---|---|---|
| Experimental Design, Variables and Risk | 0 | 24 | 5 | Strong |
| Measurement, Sampling and Microscopy | 0 | 24 | 5 | Priority |
| Data, Statistics and Uncertainty | 0 | 24 | 5 | Priority |
| Biological Molecules, Water and Inorganic Ions | 0 | 26 | 5 | Strong |
| Enzymes and Metabolic Reactions | 0 | 24 | 5 | Strong |
| Nucleic Acids, ATP and Protein Synthesis | 0 | 26 | 5 | Priority |
| Cell Structure, Organisation and Viruses | 0 | 25 | 5 | Strong |
| Membranes, Transport and Cell Division | 0 | 24 | 5 | Priority |
| Exchange Surfaces and Gas Exchange | 0 | 22 | 5 | Strong |
| Digestion and Absorption | 0 | 20 | 5 | Good |
| Animal Transport and Circulation | 0 | 24 | 5 | Priority |
| Plant Transport | 0 | 22 | 5 | Priority |
| Meiosis, Inheritance and Variation | 0 | 28 | 5 | Priority |
| Populations, Selection and Speciation | 0 | 26 | 5 | Priority |
| Classification, Biodiversity and Conservation | 0 | 26 | 5 | Strong |
| Pathogens, Immunity and Disease | 0 | 28 | 5 | Priority |
| Photosynthesis | 0 | 24 | 5 | Priority |
| Respiration | 0 | 24 | 5 | Priority |
| Ecosystems, Populations and Nutrient Cycles | 0 | 30 | 5 | Priority |
| Neuronal and Hormonal Coordination | 0 | 28 | 5 | Priority |
| Homeostasis and Excretion | 0 | 28 | 5 | Priority |
| Movement and Plant Responses | 0 | 20 | 5 | Good |
| Gene Regulation and Development | 0 | 26 | 5 | Priority |
| Sequencing, Genetic Technology and Biotechnology | 0 | 28 | 5 | Priority |
How to use this guide
How to study A-level Biology
Move between scales deliberately: identify the biological process, trace matter or information, use quantitative evidence, then evaluate the method and conclusion.
1. Locate the scale and process
Identify whether the task concerns molecules, cells, tissues, organisms, populations or ecosystems, and name the governing process.
2. Trace cause and movement
Follow matter, energy, information or signals in the correct direction using precise biological terms.
3. Use the evidence quantitatively
Show units, substitutions, ratios, rates, uncertainty or statistical decisions, and quote relevant data.
4. Judge what follows
Separate observation from explanation, test alternatives, evaluate method limits and reach a conclusion no stronger than the evidence.
Experimental Design, Variables and Risk
Turning a biological question into a valid investigation with a testable hypothesis, controlled variables, suitable controls, replication and proportionate risk management.
Key rules
Rule 1
A valid investigation changes or compares the independent variable, measures the dependent variable and controls relevant confounding variables.
Exam cue: State the biological reason each controlled variable could affect the dependent variable.
Rule 2
Controls, repeats, replication, randomisation and blinding address different threats to a trustworthy inference.
Exam cue: Distinguish repeated measurements within a sample from independent biological replicates.
Rule 3
A method should be ethical, reproducible and supported by a risk assessment that identifies hazards, risks and control measures.
Exam cue: Link every method improvement to the specific validity, reliability, precision or safety problem it addresses.
Common traps
Calling a variable controlled without saying how or why it matters.
Prevention: Do not replace a mechanism with a vague purpose statement, or infer causation from an association without experimental support.
Treating more readings as a cure for systematic error.
Prevention: Do not replace a mechanism with a vague purpose statement, or infer causation from an association without experimental support.
Confusing a hazard with the likelihood and severity of harm.
Prevention: Do not replace a mechanism with a vague purpose statement, or infer causation from an association without experimental support.
Memory anchors
Independent Variable
The factor deliberately changed or used to define comparison groups.
Dependent Variable
The response measured to test the hypothesis.
Control Variable
A relevant factor kept constant so it does not confound the comparison.
Biological Replicate
An independent organism, culture or sample that captures biological variation.
Risk Assessment
Identify hazards, estimate risk and apply proportionate control measures before practical work.
Next best moves
Quick check-up
Use a short quiz to confirm the rule pattern is actually sticking.
Check-up Questions
A student tests whether nitrate concentration affects duckweed growth. Which variable should be the dependent variable?
Six genetically different plants receive each treatment. Why are the six plants biological replicates?
Answer all questions to submit.
Next step personalized recommendations
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Official resources
Verify the details with the official sources
Use these links for eligibility, scheduling, handbook rules, and issuer updates. Our guide helps you study; official sources tell you what the testing partner currently requires.
DfE GCE AS and A-level science subject content
The common Biology knowledge, scientific practice, apparatus and mathematical requirements for England.
Ofqual GCE science conditions and requirements
The regulated assessment objectives and practical-science requirements.
AQA A-level Biology 7402
Current AQA content, assessment, mathematics and practical requirements.
Pearson Edexcel Biology A (Salters-Nuffield) 9BN0
Current Pearson Biology A qualification page and specification.
Pearson Edexcel Biology B 9BI0
Current Pearson Biology B qualification page and specification.
OCR Biology A H420
Current OCR Biology A content, assessment and practical-endorsement materials.
OCR Biology B H422 withdrawal timetable
The still-current context-based qualification and its published final teaching and assessment dates.
FAQ
Common A-level Biology questions
Is this an official exam-board study guide?
No. It is an independent resource based on the DfE subject content and scientific-skills requirements common to regulated England specifications, then checked against current AQA, Pearson Edexcel and OCR materials.
Why does the guide not follow one board's topic order?
Boards group and contextualise content differently. This guide uses the shared DfE core so a learner can build transferable knowledge, while the exact specification, required practical list and paper rubric must come from the learner's own board.
Do all boards use the same required practicals?
No. The common rules require at least 12 practical activities covering the prescribed skills and apparatus, but each awarding organisation defines its own activities. Use your board's current practical handbook and centre records.
Which current England routes were checked?
The common core was checked against AQA Biology 7402; Pearson Edexcel Biology A (Salters-Nuffield) 9BN0 and Biology B 9BI0; and OCR Biology A H420 and Biology B (Advancing Biology) H422. H422 is on a published withdrawal timetable, so learners must check their cohort.
How are written papers weighted on those routes?
AQA 7402 uses 35%, 35% and 30%; Pearson 9BN0 uses three equally weighted papers; Pearson 9BI0 uses 30%, 30% and 40%; OCR H420 uses 37%, 37% and 26%; and OCR H422 uses 41%, 37% and 22%. These route-specific weights do not create a shared topic weighting.
How does the Practical Endorsement differ by route?
It is reported separately from the A-level grade on every checked route. AQA specifies 12 required practicals; Pearson lists 18 core practicals for 9BN0 and 16 for 9BI0, with at least 12 contributing to endorsement evidence; OCR requires a minimum of 12 practical activities. Written papers still assess practical knowledge and data handling, but a multiple-choice response cannot demonstrate laboratory competence.
Is OCR Biology B still current?
OCR H422 remains available on a published withdrawal timetable: the final first-teach date is September 2026 and the final A-level assessment opportunity is June 2028. OCR Biology A H420 remains the continuing OCR route.
Are the topic allocations official weights?
No. DfE specifies common content and Ofqual sets assessment objectives, but there is no shared official percentage for these 24 study topics. The allocations provide balanced practice coverage only.
What should I learn first?
Begin with experimental design, biological molecules, enzymes, cell structure and membranes. These ideas and skills recur in exchange, inheritance, energy, homeostasis and biotechnology.