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GCSE Biology · key term
A substance that increases the rate of a chemical reaction without being used up.
Used by AQA, Edexcel and OCR
Specification 4.8 · Paper 1, Paper 2
Revise: Molecular Structure and Cellular OrganizationAn enzyme is a protein that acts as a biological catalyst. It speeds up a chemical reaction without being used up. This matters because many reactions needed for digestion, photosynthesis and respiration would otherwise occur too slowly to support life.
Specification 1.7, 1.12 · Paper 1, Paper 2
An enzyme is a protein that acts as a biological catalyst. It increases the rate of a reaction but is not used up by that reaction. This means the same enzyme molecule can catalyse the reaction repeatedly.
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A substance that increases the rate of a chemical reaction without being used up by the reaction.
Specification B1.2g · Paper 1 (Foundation), Paper 3 (Higher)
A substance that increases the rate of a chemical reaction without being used up in the reaction.
Revise: Enzyme Mechanism and MetabolismAn enzyme is a protein that acts as a biological catalyst: it increases the rate of a reaction without being used up. Enzymes allow metabolism to proceed quickly enough to support life.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A substance that increases the rate of a chemical reaction without being used up overall.
Revise: EnzymesEnzymes are biological catalysts: they increase reaction rate but are not used up overall, so the same enzyme molecule can catalyse another reaction.