5 Enzymes
(Core / Extended)

5.1 Enzymes
What you need to know:

1. Describe a catalyst as a substance that increases the rate of a chemical reaction and is not changed by the reaction
2. Describe enzymes as proteins that are involved in all metabolic reactions, where they function as biological catalysts
3. Describe why enzymes are important in all living organisms in terms of a reaction rate necessary to sustain life 
4. 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
5. Explain enzyme action with reference to: active site, enzyme-substrate complex, substrate and product
6. Explain the specificity of enzymes in terms of the complementary shape and fit of the active site with the substrate
7. Investigate and describe the effect of changes in temperature and pH on enzyme activity with reference to optimum temperature and denaturation
8. Explain the effect of changes in temperature on enzyme activity in terms of kinetic energy, shape and fit, frequency of effective collisions and denaturation
   
9. Explain the effect of changes in pH on enzyme activity in terms of shape and fit and denaturation

Videos: What are Enzymes

Videos: Factors that affect enzymes: Temperature and pH

Videos: Digestive Enzymes

EXAMPLE QUESTIONS

Videos: MCQ & SAQ

Videos: Mixed Questions - including Paper 6