Explain how the process works

24 original tasks: eight ordering chains, eight missing links and eight causal explanations. Ordering and choices are checked against the stated model. Written explanations use your own self-check.

Six tasks · saved review and resume

Protein synthesis: follow the information

Trace a eukaryotic gene from a nuclear transcript to a polypeptide, then explain where a disrupted step changes the outcome.

AQA 3.4.2 · OCR A 2.1.3

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Immune responses: connect recognition to action

Distinguish engulfment, antigen presentation and antibody secretion. Follow selected pathways without treating every immune response as one universal sequence.

AQA 3.2.4 · OCR A 4.1.1

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Six tasks · saved review and resume

Photosynthesis: connect light to carbon fixation

Follow electron flow and carbon fixation separately, then connect them through ATP and reduced NADP.

AQA 3.5.1 · OCR A 5.2.1

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Respiration: follow carbon, electrons and ATP

Locate the stages of respiration, track the role of reduced coenzymes and explain what changes when oxygen is unavailable.

AQA 3.5.2 · OCR A 5.2.2

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Follow a causal link

A useful explanation names the step, its effect on the next step and the biological consequence. For example, distinguish a loss of electron flow from a loss of the proton gradient that couples it to ATP synthesis.

These are selected shared concepts, not complete course coverage. Some reactions overlap or occur in cycles; each ordering task states the dependency chain it follows. Progress is saved in this browser, separately from your AQA account.