AQA A-Level

AQA A-Level Biology past papers, mark schemes & revision

Every AQA A-Level Biology past paper, mark scheme, examiner report, topic breakdown, worked example, and revision plan — all on one page.

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Specification · 7402

What you’ll sit

You will sit three papers, each 2 hours. Paper 1 (91 marks) covers Topics 1–4: biological molecules, cells, exchange & transport, genetic information. Paper 2 (91 marks) covers Topics 5–8: energy transfer, organisms respond, genetics & populations, control of gene expression. Paper 3 (78 marks) tests all 8 topics plus practical skills and includes a 25-mark synoptic essay. There is no AS-A2 split — A-level is a full two-year linear qualification. About 15% of marks are explicitly mathematical (statistics, percentage changes, calculations from data).

Paper structure

Three papers · 91 marks each for Papers 1 & 2, 78 marks Paper 3 · 2 hours each · Paper 1 covers Topics 1-4, Paper 2 covers Topics 5-8, Paper 3 covers content + practical skills + essay · A-level only (full course, two years)

Awarded by

Assessment and Qualifications Alliance. Exam code 7402. Specification page: AQA A-Level Biology.

Past papers · AQA A-Level Biology

Every paper, every year, with mark schemes

Below is the official series of AQA A-Level Biology past papers from 2018 onward. Each paper, mark scheme, and examiner report is free to download from the AQA assessment-resources hub. Open the AQA hub →

Year	Paper	Tier	Duration	Marks	Notes	Download
2024	Paper 1	—	2h	91	Topics 1-4: Biological molecules, Cells, Exchange & transport, Genetic information	AQA hub →
	Paper 2	—	2h	91	Topics 5-8: Energy transfer, Organisms respond, Genetics & populations, Control of gene expression	AQA hub →
	Paper 3	—	2h	78	Topics 1-8 + practical skills + essay (25 marks)	AQA hub →
2023	Paper 1	—	2h	91	Topics 1-4	AQA hub →
	Paper 2	—	2h	91	Topics 5-8	AQA hub →
	Paper 3	—	2h	78	All topics + practical skills + essay	AQA hub →
2022	Paper 1	—	2h	91	Topics 1-4	AQA hub →
	Paper 2	—	2h	91	Topics 5-8	AQA hub →
	Paper 3	—	2h	78	All topics + practical skills + essay	AQA hub →
2021	Paper 1	—	2h	91	Centre-assessed; advance info issued	AQA hub →
2021	Paper 2	—	2h	91	Centre-assessed grades	AQA hub →
2020	—	—	—	—	No exams (COVID-19 disruption). Centre-assessed grades.	AQA hub →
2019	Paper 1	—	2h	91	Topics 1-4	AQA hub →
	Paper 2	—	2h	91	Topics 5-8	AQA hub →
	Paper 3	—	2h	78	All topics + practical skills + essay	AQA hub →
2018	Paper 1	—	2h	91	Topics 1-4 — first new-spec exam	AQA hub →
	Paper 2	—	2h	91	Topics 5-8 — first new-spec exam	AQA hub →
	Paper 3	—	2h	78	All topics + practical skills + essay	AQA hub →

Mark schemes → Examiner reports → Grade boundaries →

Topics · full specification

Every topic in the AQA A-Level Biology specification

Each topic links to a deeper revision guide. The mark allocation column shows roughly how many marks per paper that topic typically attracts.

Biological molecules

~12% of total

Monomers & polymers, carbohydrates, lipids, proteins (structure & function, enzymes), nucleic acids (DNA, RNA, ATP), water, inorganic ions.

Cells

~12% of total

Eukaryotic & prokaryotic cells, organelles, the cell cycle, mitosis, transport across cell membranes, cell recognition & the immune system.

Organisms exchange substances with their environment

~12% of total

Surface area:volume, gas exchange in fish/insects/plants/mammals, digestion & absorption, mass transport (haemoglobin, the heart, xylem/phloem).

Genetic information, variation and relationships

~12% of total

DNA, genes, chromosomes, meiosis, mutation, genetic diversity & adaptation, species & taxonomy, biodiversity.

Energy transfers in and between organisms

~12% of total

Photosynthesis (light-dependent & Calvin cycle), respiration (glycolysis, link reaction, Krebs cycle, oxidative phosphorylation), energy & ecosystems, nutrient cycles.

Organisms respond to changes in their environment

~12% of total

Stimuli & receptors, nervous coordination, the brain & autonomic nervous system, neuromuscular junctions, hormones, plant responses (tropisms), control of heart rate.

Genetics, populations, evolution & ecosystems

~14% of total

Inheritance (monohybrid, dihybrid, sex linkage), populations (Hardy-Weinberg, gene pools), evolution, speciation, ecosystems (succession, communities).

Control of gene expression

~14% of total

Mutation, gene expression & cell differentiation, regulation of transcription & translation (operons, transcription factors), epigenetics, cancer, gene cloning & genetic engineering, gene therapy.

Assessment objectives

How your marks are awarded

Examiners award marks against three Assessment Objectives. Knowing the split helps you target practice — most students under-prepare for AO3.

AO1 ~30%

Knowledge and understanding

Recall facts, terminology, scientific procedures.

AO2 ~45%

Apply knowledge and understanding

Apply to familiar and unfamiliar contexts including data analysis.

AO3 ~25%

Analyse, interpret and evaluate

Make judgements based on scientific evidence; evaluate methodology, conclusions, arguments.

Worked examples · step by step

How to actually answer these questions

Each worked example shows the full mark-scheme path. Steps map to where examiners typically award method (M) and accuracy (A) marks.

Hardy-Weinberg calculation (Paper 2)

Question. In a population, 16% of individuals have the recessive phenotype (genotype aa). Calculate (a) the frequency of the A allele, (b) the percentage of heterozygous individuals.

1. Identify q². Recessive phenotype frequency = q² = 0.16.
2. Calculate q. q = √0.16 = 0.4.
3. Calculate p. p + q = 1 ⟹ p = 0.6.
4. Calculate heterozygous frequency. 2pq = 2 × 0.6 × 0.4 = 0.48 = 48%.

Answer (a) Frequency of A = 0.6. (b) 48% of the population are heterozygous (Aa).

Examiner tip. AQA mark schemes give 1 mark for q² recognition, 1 for q, 1 for p (or 1 − q), 1 for the 2pq calculation. Don't cut corners.

Photosynthesis rate-limiting factor (Paper 2)

Question. A scientist measures photosynthesis rate at different CO₂ concentrations at constant light intensity and temperature. Rate plateaus above 0.4% CO₂. Explain why.

1. From 0% to 0.4% CO₂. Rate rises because CO₂ is the rate-limiting factor — more CO₂ means more substrate for the Calvin cycle (specifically, for combining with RuBP to form glycerate-3-phosphate).
2. At 0.4% CO₂. CO₂ stops being the limiting factor.
3. Above 0.4%. A different factor becomes limiting — likely light intensity (since temperature is constant). Adding more CO₂ doesn't increase rate because the Calvin cycle is now starved of ATP and NADPH from the light-dependent reactions.

Answer CO₂ is rate-limiting below 0.4%. Above 0.4%, light intensity becomes rate-limiting, so adding more CO₂ has no effect on the rate.

Examiner tip. A high-level answer names the specific molecules involved (RuBP, GP, ATP, NADPH) — AQA examiners give credit for this depth on Level 3 marks.

Synoptic essay structure (Paper 3, 25 marks)

Question. Write an essay on "The importance of water in biological processes".

1. Plan 5 specific topic-areas from the spec. Choose 5 topics where water is biologically critical, e.g.: (1) properties of water (cohesion, polarity), (2) water in photosynthesis, (3) water in transpiration, (4) water in homeostasis (osmoregulation), (5) water in mass transport (haemoglobin/blood).
2. One paragraph per topic. Each paragraph: name the topic, describe water's role, link to the underlying chemistry/biology.
3. Use precise terminology. Hydrogen bonds, solvent, specific heat capacity, osmosis, water potential, cohesion-tension theory.
4. Synoptic links between paragraphs. The synoptic mark is for showing CROSS-TOPIC understanding. Link photosynthesis and transpiration via the leaf, or osmoregulation and mass transport via kidneys.
5. Conclusion. Restate the breadth of biological processes water underpins.

Answer A 25-mark essay structured as: intro + 5 cross-topic paragraphs + brief conclusion. Target 5 paragraphs from 5 different spec topics.

Examiner tip. The 25-mark essay is the single highest-leverage block of marks in A-Level Biology. Practising 4-5 essays before the exam (with different topics) is the single most effective revision activity.

Examiner-report distilled

The mistakes most candidates make

Pulled from AQA’s own examiner reports across recent series. Each one costs marks. Each one is fixable.

Mistake 1

Treating "describe" and "explain" identically.

Fix. "Describe" = state what happens. "Explain" = state what happens + WHY. Always identify which the question wants.

Mistake 2

In enzyme questions, naming the substrate but not the enzyme-substrate complex.

Fix. Use the full vocabulary: substrate binds to active site → enzyme-substrate complex forms → products form → enzyme is unchanged and can bind again.

Mistake 3

Confusing transcription with translation, or DNA replication with transcription.

Fix. Replication: DNA → DNA (in nucleus, S-phase). Transcription: DNA → mRNA (in nucleus). Translation: mRNA → protein (at ribosome).

Mistake 4

In a respiration calculation, forgetting that fermentation yields only 2 ATP per glucose (no oxidative phosphorylation).

Fix. Aerobic: 32 ATP. Anaerobic (fermentation): 2 ATP. Always check whether oxygen is present.

Mistake 5

Drawing a population graph but not labelling the carrying capacity (K).

Fix. On any sigmoid (logistic) growth curve, K is the upper plateau. Label it.

Mistake 6

In a Hardy-Weinberg problem, confusing allele frequency (p, q) with genotype frequency (p², 2pq, q²).

Fix. Allele = single letter (frequency p or q). Genotype = pair (frequency p², 2pq, or q²). Read the question carefully for which it wants.

Grade boundaries · most recent series

What it took to hit each grade

Indicative boundaries from the most recent published series. Boundaries shift slightly year to year. Open the grade-boundary calculator →

Grade	Marks	% of total
A*	200	76.9%
A	169	65%
B	138	53.1%
C	107	41.2%
D	76	29.2%
E	45	17.3%

Revision plan · 8 weeks to exam

An 8-week plan that actually works

A staged sequence designed by examiners, not motivational posters. Each block has a single focus and a single measurable outcome.

1

Sept–Dec (Y13)

Y12 review + new Y13 (Topics 5–8). Lock down Topics 1–4 simultaneously.

Outcome. All 8 topics covered at least once by Christmas.
2

Jan–Easter

Required Practicals deep dive (12 across the course). Build a practical-skills notebook.

Outcome. Practical-skills questions on Paper 3 confident.
3

Easter–exam

Past papers (1 per week) + essay practice (one 25-marker per week).

Outcome. Essay technique sharp.
4

Final 2 weeks

Targeted weakness practice. No new content.

Outcome. Calm, exam-ready.

Last reviewed 26 May 2026.

Related · explore the spec further

More on AQA A-Level Biology

All boards for Biology AQA across all subjects Grade-boundary calculator All past papers 2026 question-bank insights How to revise (study science) All revision guides AQA official →

About AQA A-Level Biology

AQA is the largest exam board in England, setting GCSE and A-Level exams taken by millions of students each year. Known for clear mark schemes and well-structured specifications across all major subjects.

AQA A-Level Biology is assessed across three written papers, each lasting 2 hours and worth 96 marks, totalling 288 marks. You'll also complete a practical endorsement component that doesn't contribute to your final grade but is separately reported. AQA's specification is renowned for its clarity and logical progression through eight core topic areas. Their mark schemes favour structured, methodical answers with clear command word interpretation. Unlike some boards, AQA's papers are deliberately cumulative—later topics build on foundational knowledge—so you'll need integrated understanding rather than compartmentalised learning. Their questions balance calculation-based problems with extended writing, making exam technique highly valuable.

Topics in AQA A-Level Biology

1 Biological Molecules

2 Cells

3 Exchange & Transport

4 Genetics

5 Energy Transfers

6 Organisms & Environment

7 Gene Expression

8 Practical Skills

Study Tips for AQA Biology

Create a topic matrix linking AQA's eight core topics to the three papers. Papers 1 and 2 contain topic-specific questions, while Paper 3 tests synoptic understanding across all topics. Structuring revision this way helps you anticipate which topics might appear where and identify knowledge gaps before the exam.

Practice AQA's command words extensively—'explain', 'evaluate', 'analyse' and 'discuss' appear frequently and carry specific mark allocations. AQA's mark schemes award marks for chain-of-reasoning, so annotate past paper answers to understand exactly how they credit logical progression, not just correct conclusions.

Work through AQA's practical skills questions systematically. AQA dedicates marks across papers to experimental design, data analysis, and graph interpretation. Familiarise yourself with their favoured practicals: enzyme kinetics, osmosis, respiration, and photosynthesis calculations appear repeatedly in different contexts.

Use AQA's specification document as your revision blueprint, not generic textbooks. The specification precisely defines what you need to know, and AQA examiners work strictly within it. Tick off each sub-heading as you revise to ensure you haven't missed niche content like properties of water or ATP synthesis mechanisms.

Exam Tips for AQA Biology

Allocate your 2-hour papers strategically: rough 32 minutes per paper section. AQA's papers flow logically by topic, so don't get stuck on single questions. If a question takes longer than 2-3 minutes per mark, flag it and return later. AQA rewards completion over perfection, especially since later papers test synoptic thinking.

Answer extended response questions (6-8 marks common on AQA papers) using the Point-Evidence-Explain framework AQA's mark schemes expect. Draft bullet points first outlining your chain-of-reasoning, then write in prose. AQA penalises vague statements—every point needs specific biological detail to earn marks.

Manage Paper 3 time carefully. This synoptic paper often includes complex scenarios requiring you to link multiple topics—metabolism, ecology, and genetics simultaneously. Practice moving between topics quickly using past papers. AQA's 96-mark allocation means roughly 1.25 minutes per mark, so efficient, focused answers are essential.

Frequently Asked Questions

How many papers are in AQA A-Level Biology?

AQA A-Level Biology comprises three written examination papers. Papers 1 and 2 (each 2 hours, 96 marks) assess specific topics, while Paper 3 (2 hours, 96 marks) focuses on synoptic understanding across the entire specification. Additionally, you complete a practical endorsement involving at least 12 practicals, though this doesn't contribute marks toward your final grade.

What topics does AQA A-Level Biology cover?

AQA's Biology specification contains eight core topics: Biological Molecules, Cells, Exchange & Transport, Genetics, Energy Transfers, Organisms & Environment, Gene Expression, and Practical Skills. Papers 1-2 cover topics 1-4 and 5-8 respectively, while Paper 3 synoptically assesses all eight. AQA's specification document clearly delineates learning outcomes for each topic.

Is AQA A-Level Biology hard?

AQA A-Level Biology is appropriately rigorous for A-Level standard. Its difficulty lies in cumulative knowledge and synoptic thinking rather than obscure content—AQA's specification is transparent about requirements. Paper 3's synoptic focus demands integrated understanding, but AQA's clear mark schemes and predictable question types reward consistent preparation. Most students find it manageable with structured revision.