Researchers extract three enzymes from bacterial extremophiles. The researchers test the enzymes for use in an industrial process.
The same enzyme concentration and substrate concentration are used in every test.
| Enzyme | Rate at 25 °C and low salt in micromoles of product per minute | Rate at 80 °C and low salt in micromoles of product per minute | Rate at 25 °C and high salt in micromoles of product per minute | Rate at 80 °C and high salt in micromoles of product per minute |
|---|---|---|---|---|
| P | 10.0 | 8.8 | 4.0 | 3.2 |
| Q | 10.0 | 3.5 | 8.5 | 3.0 |
| R | 9.0 | 7.6 | 7.2 | 6.3 |
The industrial process operates at 80 °C and high salt concentration. A suitable enzyme must:
Compare how enzymes P, Q and R respond to the two conditions in which only one factor is extreme.
Calculate the percentage of its rate at 25 °C and low salt concentration that enzyme R retains at 80 °C and high salt concentration.
Evaluate which enzyme should be selected for the industrial process.
82 exam-style questions on AQA GCSE Biology 7.1 Adaptations, interdependence and competition, covering 7.1.1 Communities, 7.1.2 Abiotic factors, 7.1.3 Biotic factors, and 7.1.4 Adaptations. Each one has a worked solution and a mark scheme showing where the marks go.