All living cells contain enzymes that act as catalysts.
Explain how an enzyme acts as a catalyst in terms of activation energy.
The table lists some enzymes, their substrates, and their products. Complete the table by giving the missing information for (i) to (v).
| Enzyme | Substrate | Product(s) |
|---|---|---|
| (i) | maltose | glucose |
| sucrase | sucrose | (ii) |
| amylase | (iii) | maltose |
| protease | proteins | (iv) |
| lipase | (v) | fatty acids and glycerol |
Explain how changes in temperature affect the rate of an enzyme-controlled reaction.
21 exam-style questions on Edexcel IGCSE Biology Biological molecules. Each one has a worked solution and a mark scheme showing where the marks go.