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Edexcel IGCSE·Biology·IGCSE Biology

Enzymes & Nutrition

13 min read

Enzymes and the factors affecting them, food tests, a balanced diet, and digestion.

Enzymes control the chemical reactions of life, including the digestion of food.

Enzymes

Enzymes are biological catalysts that speed up reactions without being used up. Each has a specific active site (lock-and-key). They work best at an optimum temperature and pH; outside this they denature (the active site changes shape).

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