24 September 2026 · 7 min read
Muscle contraction and the sliding filament theory, step by step
From the action potential at the neuromuscular junction to the power stroke — the exact sequence examiners expect.
Read the guide →AQA A-Level Biology revision blog
Free guides written against the AQA specification (7401 / 7402) — the content examiners reward, the wording that earns marks, and how to plan your revision.
22 September 2026 · 8 min read
Gene technology: PCR, recombinant DNA and genetic fingerprinting
The three temperatures of PCR, sticky ends, marker genes and how bands on a gel identify a person — a complete Topic 8 walkthrough.
Read the guide →20 September 2026 · 7 min read
Nitrogen and phosphorus cycles: every step and every microorganism
The four microbial processes in the nitrogen cycle, why phosphorus has no gas phase, and how fertilisers lead to eutrophication.
Read the guide →18 September 2026 · 7 min read
Statistics in A-Level Biology: chi-squared, t-test and correlation
Choosing the right test, writing the null hypothesis and interpreting p = 0.05 — the statistics marks most students leave on the table.
Read the guide →16 September 2026 · 8 min read
Transport across membranes: diffusion, osmosis and active transport
Water potential, carrier proteins and the sodium–glucose co-transport mechanism, written the way mark schemes want it.
Read the guide →14 September 2026 · 6 min read
Food tests for AQA Biology: Benedict's, biuret, iodine and emulsion
Exact methods and positive results for every test in Topic 1, including the non-reducing sugar test students most often get wrong.
Read the guide →12 September 2026 · 8 min read
The heart and the cardiac cycle: pressure graphs made simple
Every pressure graph question comes down to one rule: valves open when pressure behind them is higher. Here is how to apply it.
Read the guide →10 September 2026 · 7 min read
DNA replication explained: the semi-conservative model and Meselson–Stahl
Helicase, polymerase, antiparallel strands and the density-gradient experiment that proved it — the full story in exam-ready order.
Read the guide →19 May 2026 · 8 min read
Exam technique: what AQA command words actually ask you to do
Most lost marks are not knowledge gaps — they are answers to a different question. Here is what each command word demands.
Read the guide →5 May 2026 · 10 min read
Genetics: monohybrid crosses, epistasis and the Hardy–Weinberg equation
Genetics marks are procedural: define your symbols, draw the full cross, state the ratio. Then the maths is only two equations.
Read the guide →21 April 2026 · 11 min read
Respiration and photosynthesis compared: the four stages of each, without the confusion
Both processes are electron transfer chains with extra steps bolted on. Learn them side by side and Topic 5 shrinks to half the size.
Read the guide →7 April 2026 · 10 min read
Immunity and vaccination: phagocytosis, the specific response and antibody questions
Immunity questions reward sequence and precision: the right cells, in the right order, doing the one thing the mark scheme names.
Read the guide →24 March 2026 · 9 min read
Cell structure and microscopy: organelles, magnification and the maths examiners love
Topic 2 is half recall and half arithmetic. Here are the organelle descriptions that score, the fractionation sequence, and how to never lose a magnification mark again.
Read the guide →10 March 2026 · 7 min read
Homeostasis and nervous coordination: negative feedback made simple
Topic 6 rewards a single habit: always answer in the order receptor, coordinator, effector, response — then add the numbers.
Read the guide →25 February 2026 · 6 min read
Protein synthesis step by step: transcription, splicing and translation
Protein synthesis is a sequence question: the marks go to students who put the events in the right order with the right molecules named.
Read the guide →11 February 2026 · 9 min read
The AQA A-Level Biology required practicals: what gets examined
You are not asked to remember the lab day — you are asked about variables, controls and interpreting the data. Here is what to revise for each practical.
Read the guide →28 January 2026 · 7 min read
Enzymes explained: induced fit, inhibition and the marks examiners want
Enzyme questions appear on almost every paper. Here is the model examiners expect, the graph shapes to describe, and the exact wording that earns marks.
Read the guide →14 January 2026 · 8 min read
How to revise AQA A-Level Biology: a 12-week plan that works
Reading notes feels productive but rarely moves grades. Here is a 12-week schedule built around active recall, spacing and exam-style practice.
Read the guide →