Muscle contraction and the sliding filament theory, step by step
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Every one of the eight AQA topics, written to the spec: 640 flip flashcards, 170 exam-style questions with AQA-style mark schemes, and five full practice papers you can sit under timed conditions.
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Card 7 of 46
Describe the induced-fit model of enzyme action.
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640
Flip flashcards
170
Exam-style questions
5
Full practice papers
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Concise, spec-aligned notes with highlighted key terms, diagrams and comparison tables.
Protein structure
Amino acids join by condensation to form a peptide bond, releasing water.
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Answer
Large surface area, thin walls and a steep concentration gradient maintained by ventilation and circulation.
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Exam-style questions with the marking points revealed after you answer, so you learn how marks are awarded.
Explain how a resting potential is maintained across an axon membrane. (3 marks)
Mark scheme
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57 marks · self-marked
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From the action potential at the neuromuscular junction to the power stroke — the exact sequence examiners expect.
The three temperatures of PCR, sticky ends, marker genes and how bands on a gel identify a person — a complete Topic 8 walkthrough.
The four microbial processes in the nitrogen cycle, why phosphorus has no gas phase, and how fertilisers lead to eutrophication.