We counted every question in our own AS Level Biology 9700 question bank — 316 questions worth 1,680 marks, 2023 to 2026 — and sorted them into the 11 chapters of the syllabus. Transport in Mammals carries the most marks.
Every chapter, heaviest first
| Chapter | Questions | Marks | Share | |
|---|---|---|---|---|
| Transport in Mammals | 34 | 226 | 13.5% | |
| Immunity | 29 | 181 | 10.8% | |
| Biological Molecules | 37 | 177 | 10.5% | |
| Transport in Plants | 28 | 164 | 9.8% | |
| Nucleic Acids and Protein Synthesis | 30 | 162 | 9.6% | |
| Cell Structure | 33 | 160 | 9.5% | |
| Enzymes | 26 | 143 | 8.5% | |
| The Mitotic Cell Cycle | 25 | 126 | 7.5% | |
| Infectious Diseases | 25 | 123 | 7.3% | |
| Cell Membranes and Transport | 26 | 119 | 7.1% | |
| Gas Exchange | 23 | 99 | 5.9% |
The top 5 of 11 chapters hold half the marks in the bank. The three heaviest are Transport in Mammals, Immunity, Biological Molecules. The lightest is Gas Exchange, at 5.9% of the marks.
Inside the chapters
| Sub-topic | Chapter | Questions | Marks |
|---|---|---|---|
| Translocation: loading sucrose and mass flow | Transport in Plants | 11 | 65 |
| Monoclonal antibodies | Immunity | 7 | 59 |
| Prokaryotic and eukaryotic cells | Cell Structure | 10 | 53 |
| Transcription and RNA processing | Nucleic Acids and Protein Synthesis | 12 | 52 |
| Haemoglobin and the oxygen dissociation curve | Transport in Mammals | 6 | 51 |
| Factors in the spread and control of infectious diseases | Infectious Diseases | 8 | 48 |
| Cell structures and their functions | Cell Structure | 9 | 47 |
| Haemoglobin and collagen | Biological Molecules | 9 | 46 |
| Water pathways across the root: apoplast and symplast | Transport in Plants | 7 | 46 |
| Blood vessels | Transport in Mammals | 8 | 44 |
How to use this
Revise the heaviest chapters first. A chapter worth 13% of the marks deserves more than one worth 5.9%.
Use it to decide what to practise, not what to skip. A light chapter can still be the difference between two grades, and Cambridge can set anything on the syllabus.
Check yourself chapter by chapter rather than by whole papers, so a weak topic shows up while there is still time to fix it.
These are ExamYard’s own figures: the questions in our AS Level Biology 9700 question bank, grouped into the chapter of the syllabus each one tests, and added up by the marks each carries. No question text, mark scheme or examiner report is reproduced on this page. The printed book and the online bank are counted separately, so the totals on this page need not match the book’s own page.