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AQA Paper 3 includes a 25-mark essay chosen from two titles. This planner helps organise ideas; it does not assess your biology or predict marks. The titles below are original Biology Help practice prompts. Official assessment format.
From a topic name to a useful paragraph
“Respiration makes ATP” names an outcome. A developed explanation traces electron transfer, proton pumping and ATP synthase, then identifies a process whose function depends on the ATP supply. Whether that example is useful depends on the exact essay title.
A link should add reasoning. Comparing proton gradients in chloroplasts and mitochondria can explain a shared mechanism, while preserving the differences in membranes, electron sources and products. Mentioning both organelles without explaining the connection adds little.
This tool counts distinct main specification sections for orientation only. AQA essay judgement depends on the answer as a whole; neither six blocks nor a section count guarantees a mark. Use official papers and guidance with your teacher’s feedback. AQA assessment resources.
All twenty topic prompts
3.1.4 · Enzyme specificity
Explain substrate binding and catalysis, then use a named reaction to show the consequence of activity.
A vague claim that enzymes keep organisms alive does not explain the title.
3.1.4 · Protein structure and function
Connect amino-acid sequence, folding and interactions to a named protein’s function.
Do not use “shape” without explaining how that shape supports the chosen function.
3.1.5 · DNA and information storage
Explain how base sequence carries information and how complementary pairing supports copying.
Separate sequence information from the hydrogen bonds holding strands together.
3.2.3 · Selective membrane transport
Distinguish channels, carriers and the lipid bilayer; use a specific transported substance.
Not every transport pathway consumes ATP directly.
3.2.4 · Antigen recognition and immunity
Connect recognition, clonal selection and an appropriate effector or memory response.
Antibodies do not engulf pathogens.
3.3.2 · Gas-exchange surfaces
Use diffusion distance, area and maintained gradients to explain exchange in a named organism.
Identify the substances and directions of diffusion.
3.3.3 · Digestion and absorption
Connect hydrolysis to absorption; distinguish digestion in the lumen from membrane transport.
Food molecules are not all absorbed intact.
3.3.4 · Mass transport
Explain pressure-driven movement and exchange, with a named circulatory or plant pathway.
Distinguish bulk flow from diffusion at a surface.
3.4.2 · Transcription and translation
Follow information from a gene to a polypeptide and explain a specific functional consequence.
A list of stages is not a link to the essay theme.
3.4.3 · Mutation and variation
Explain a possible sequence change and its effect; distinguish mutation from selection.
Not every substitution changes the polypeptide.
3.5.1 · Photosynthesis and carbon fixation
Connect electron flow, ATP/reduced NADP and carbon fixation to a useful organic product.
Do not describe energy as being created.
3.5.2 · Respiration and ATP production
Explain reduced coenzymes, proton gradients and ATP synthesis, then name an ATP-consuming process.
Oxygen is not a direct glycolysis reactant.
3.5.3 · Production and energy transfer
Connect photosynthetic production, respiration and biomass available to consumers.
Energy transfers through ecosystems; it is not recycled like mineral elements.
3.6.2 · Neurones and synapses
Connect membrane ion movements to action potentials and chemical synaptic transmission.
Distinguish electrical signalling along an axon from diffusion across a chemical synapse.
3.6.3 · Skeletal muscle contraction
Explain calcium regulation and actin–myosin interaction, with ATP’s specific roles.
Filaments slide rather than themselves shortening.
3.6.4 · Blood-glucose regulation
Connect a detected change to hormone action and a response that opposes the disturbance.
Distinguish insulin, glucagon, glucose and glycogen.
3.6.4 · Water balance and the kidney
Explain ADH, aquaporins and water reabsorption along a water-potential gradient.
ADH alters permeability; it does not pump water through aquaporins.
3.7.3 · Natural selection
Explain inherited variation, different reproductive success and changing allele frequency.
Do not claim that organisms choose to mutate because they need an adaptation.
3.8.2 · Control of gene expression
Explain a named control of transcription or later expression and its effect on protein production.
Different cell functions do not generally require every cell to have a different genome.
3.8.4 · Recombinant DNA applications
Connect obtaining and introducing DNA to expression of a useful product in a suitable host.
Describe the molecular mechanism and an application relevant to the title, not a list of techniques.
Practise causal explanations · Command-word guidance · Official AQA papers