IGCSE Biology - Enzymes (5.1)

Cambridge IGCSE Biology (0610/0970)
Chapter 5 - Enzymes
Topic 5.1 - Enzymes
For exams in 2023, 2024 & 2025 (core and extended)

As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam!

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Timestamps:
0:00 Contents
0:30 Enzymes
1:04 Enzyme action
1:46 Temperature
2:34 PH
3:07 Enzyme action (extended)
3:44 Temperature and PH (extended)

Core content:
- Describe a catalyst as a substance that increases the rate of a chemical reaction and is not changed by the reaction.
- Describe enzymes as proteins that are involved in all metabolic reactions, where they function as biological catalysts.
- Describe why enzymes are important in all living organisms in terms of a reaction rate necessary to sustain life.
- Describe enzyme action with reference to the shape of the active site of an enzyme being complementary to its substrate and the formation of products.
- Investigate and describe the effect of changes in temperature and pH on enzyme activity with reference to optimum temperature and denaturation.

Extended content:
- Explain enzyme action with reference to; active site, enzyme-substrate complex, substrate and product.
- Explain the specificity of enzymes in terms of the complementary shape and fit of the active site with the substrate.
- Explain the effect of changes in temperature on enzyme activity in terms of kinetic energy, shape and fit, frequency of effective collisions and denaturation.
- Explain the effect of changes in pH on enzyme activity in terms of shape and fit and denaturation.

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