A student investigates the effect of enzyme concentration on the rate of an enzyme-controlled reaction.
She uses the same volume and concentration of substrate each time. There is always more substrate than the enzyme can break down.
The Table shows her results.
Table
| Concentration of enzyme in %\%% | Rate of reaction in arbitrary units |
|---|---|
| 0.0 | 0 |
| 0.5 | 6 |
| 1.0 | 12 |
| 1.5 | 18 |
| 2.0 | 24 |
| 2.5 | 30 |
Describe the relationship between the concentration of enzyme and the rate of reaction.
Use data from the Table in your answer.
Explain why increasing the concentration of enzyme increases the rate of reaction.
Predict the rate of reaction at an enzyme concentration of 3.0%.
The student repeats the investigation at an enzyme concentration of 3.0%, but uses a much smaller volume of substrate.
The rate of reaction is lower than she predicted.
Suggest why.
184 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.