Cambridge IGCSE Biology
5.1Enzymes
Enzymes in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic46 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 5.1.1Describe a catalyst, and describe enzymes as proteins that act as biological catalysts in all metabolic reactions and are needed to keep reactions fast enough to sustain life.
- 5.1.2Describe enzyme action in terms of an active site whose shape is complementary to the substrate, and the formation of products.
- 5.1.3Investigate and describe how temperature and pH affect enzyme activity, including the optimum temperature and denaturation.
- 5.1.4Supplement: explain enzyme action and specificity using the terms active site, enzyme-substrate complex, substrate and product, and the complementary fit of substrate and active site.
- 5.1.5Supplement: explain the effect of temperature (kinetic energy, effective collisions, shape and fit, denaturation) and of pH (shape and fit, denaturation) on enzyme activity.
Lessons
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Effects of temperature and pH on enzymes
26 min
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Enzymes and how they work
24 min
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