Introduction

Enzymes usually act very quickly, but there are some factors that can affect their speed. Some enzymes are affected by temperature and pH. Each enzyme has a temperature and pH at which it works best.

Reading

Read through and make notes on pages 43-46 of your coursebook.

Note that the experiments covered in these pages are very popular in exam questions, so you should pay attention to the methods and techniques used.

Links

Now work through the following resources:

WATCH – Enzymes – How Temperature and pH Affect Rate of Reaction (YouTube)

WATCH – Investigation of the action of lipase (YouTube)

WATCH – Enzyme Experiments: Factors that Affect Enzyme Activity (YouTube)

Experiment

Remember to review the Safety Guide.

PRACTICAL - How Enzyme Action Can be Affected

Activity

Answer the questions on pages 43 to 46.

Update your flash cards with the key words on pages 43-46.

Review

Complete the Questions on Factors that Affect Enzymes on pages 43-46. Check your answers.