7402 · AQA A Level
7402/31
(Synoptic & Practical)
Biology · June 2023 · Variant 1
Relative difficulty
Analysis source: AQA
Analysis aligned to the official syllabus and assessment design.
4.0 / 5
260
360 min
Cell recognition and the immune system
Cohort performance
Session statistics from official examination reports
Total marks
260
Duration
360 min
Session difficulty
4.0 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
A significant proportion of marks were concentrated in Cell Recognition & the Immune System, which spanned multiple high-stakes questions across Paper 1 and Paper 3.
Students who mastered the mechanics of ELISA, monoclonal antibody production, and active/passive immunity secured a distinct advantage.
Conversely, many students dropped easy marks on fundamental structural details.
For instance, in homeostasis questions (proximal convoluted tubule), failing to qualify terms with 'many' (e.g., many mitochondria or many carrier proteins) was penalized once across the question.
Question difficulty map
How candidates performed on each question in this series
No data available in official reports
Assessment objectives
Skill and AO weighting from official examiner commentary
Skill weighting
Shows the skill mix this paper tested most heavily.
Knowledge
Weight: 4100%Recall
Weight: 375%Application of
Weight: 250%Practical & Numerical Skills
Weight: 125%
Method marks watchlist
Where working, steps, or method marks were commonly lost
No data available in official reports
Recurring mistakes across years
Themes examiners flag in multiple recent sessions for this subject
No data available in official reports
Question choice intelligence
Mean scores and popularity for optional questions (HKDSE electives)
No data available in official reports
Level exemplars
What candidate scripts at each grade level looked like
No data available in official reports
Grade & admission context
How marks relate to grade thresholds and entry standards
Report type
Examiner report — national grade boundaries and question-level commentary
Level A*
Approx. 69% of maximum mark
Level A
Approx. 59% of maximum mark
Level B
Approx. 48% of maximum mark
Level C
Approx. 38% of maximum mark
Level D
Approx. 27% of maximum mark
Level E
Approx. 17% of maximum mark
Deep insights
What top candidates did
Techniques and approaches examiners rewarded in this series
No data available in official reports
Command word playbook
How to match each command word to the expected response style
State features in sequence or list observable properties — do not explain causes unless asked.
Give reasons and link mechanism to outcome; each point needs a because/so chain.
Show formula, substitution, and unit; method marks need visible working.
Weigh arguments for and against with evidence; end with a supported judgement.
Apply knowledge to an unfamiliar context; concise, practical points score best.
Match the expected response style for “Give” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.8
Min per mark: 1.4
Syllabus traceability
Topics linked to questions and mark weighting in this session
Cell recognition and the immune system
23 marks this session
Stimuli, both internal and external, are detected and lead to a response
13 marks this session
Cell structure
12 marks this session
Mass transport
11 marks this session
Nutrient cycles
11 marks this session
MCQ trap analytics
Commonly chosen wrong options from examiner commentary
No data available in official reports
Topic heatmap across years
Mark concentration by topic and exam year for this subject
Mark intensity
Mass transport
Stimuli, both internal and external, are detected and lead to a response
Nutrient cycles
Cell structure
Synoptic Essay
Cell recognition and the immune system
Populations in ecosystems
Photosynthesis
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 1 (Core Topics 1-4):
Paper 2 (Core Topics 5-8):
Paper 3 (Synoptic & Essay):
Marks you can still earn
Where valid approaches outside the mark scheme may still gain credit
No data available in official reports
Practise what examiners flagged
Target weak topics from this report inside the Revui app
Cell recognition and the immune system
23 marks this session
Practise in RevuiStimuli, both internal and external, are detected and lead to a response
13 marks this session
Practise in RevuiCell structure
12 marks this session
Practise in RevuiMass transport
11 marks this session
Practise in RevuiNutrient cycles
11 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
A significant proportion of marks were concentrated in Cell Recognition & the Immune System, which spanned multiple high-stakes questions across Paper 1 and Paper 3.
- 2Message
Students who mastered the mechanics of ELISA, monoclonal antibody production, and active/passive immunity secured a distinct advantage.
- 3Message
Conversely, many students dropped easy marks on fundamental structural details.
- 4Message
For instance, in homeostasis questions (proximal convoluted tubule), failing to qualify terms with 'many' (e.g., many mitochondria or many carrier proteins) was penalized once across the question.
Teacher briefing pack
One-page session summary for tutors and classroom review
June 2023 2023
Biology
A significant proportion of marks were concentrated in Cell Recognition & the Immune System, which spanned multiple high-stakes questions across Paper 1 and Paper 3. Students who mastered the mechanics of ELISA, monoclonal antibody production, and active/passive immunity secured
A significant proportion of marks were concentrated in Cell Recognition & the Immune System, which spanned multiple high-stakes questions across Paper 1 and Paper 3.
Students who mastered the mechanics of ELISA, monoclonal antibody production, and active/passive immunity secured a distinct advantage.
Conversely, many students dropped easy marks on fundamental structural details.
- Total marks
- 260
- Duration
- 360 min
- Session difficulty
- 4.0 / 5
Session analysis
A significant proportion of marks were concentrated in Cell Recognition & the Immune System, which spanned multiple high-stakes questions across Paper 1 and Paper 3. Students who mastered the mechanics of ELISA, monoclonal antibody production, and active/passive immunity secured a distinct advantage. Conversely, many students dropped easy marks on fundamental structural details. For instance, in homeostasis questions (proximal convoluted tubule), failing to qualify terms with 'many' (e.g., many mitochondria or many carrier proteins) was penalized once across the question.
Updated Jun 14, 2026
Paper breakdown
Paper 1 (Core Topics 1-4):
Paper 2 (Core Topics 5-8):
Paper 3 (Synoptic & Essay):
Top chapters
Exam structure insights
Marks by chapter
See where the marks were concentrated so revision time goes to the highest-value topics.
Mark accessibility
Estimate which marks were basic, mid-level, or high-difficulty.
71% within easy or medium reach
Command word frequency
Spot common command words so answers match the expected response style.
Question type mix
Compare the mark share of each paper section and question type.
Short Answer
(1-3 marks)
130·60·50%
Long Answer & Essay
70·12·27%
Calculations
35·18·13%
Data Evaluation
25·10·10%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Time vs marks
Compare marks with suggested time allocation to plan exam pacing.
Paper 3 Section A
0.71 m/minPaper 3 Section B (
0.56 m/minTotal marks
78
Total time
120 min
Avg pace
0.65
Cumulative marks ladder
The line is your running mark total question by question; dashed lines are the estimated grade cut-offs. See which question the line crosses your target grade at, so you know how far you must answer cleanly and which questions decide a band.
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Respiration
85%85%
Gene technologies & Recombinant DNA
80%80%
Photosynthesis light-dependent reaction details
75%75%
Examiner notes & key calculations
- Gene vs. Allele Confusion: In evolutionary questions (natural selection of P. vivax resistance), candidates frequently lost marks by stating that a 'mutation produced a new gene' instead of a new allele.
- Digestive Enzymes: For Paper 1, Question 4.3, explaining how antibodies are digested required step-by-step detailing of endopeptidases, exopeptidases, and dipeptidases hydrolysing peptide bonds. Many students simply wrote 'hydrolysed by enzymes' without naming them.
- Mathematical Precision: Calculations such as dilution series, magnification, and rates of respiration (Paper 3) strictly required answers in standard form to 2 significant figures (e.g., 2.5×10−2 2.5 \times 10^{-2} 2.5×10−2). Rounding errors and missing units remain major sources of lost marks.
Exam tips
Paper format
- Duration
- 2h
- Total marks
- 78
- Weighting
- 30%
- Question types
- Short Answer (Factual & Recall), Data Analysis & Evaluation, Mathematical & Practical Calculations, Synoptic Essay
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.