A technician is choosing the concentration of protease for a protein digestion test. Each mixture contains the same starting mass of protein and is left to react for one minute.
The results from four trial concentrations are shown in the table.
| Protease concentration in %\%% | Mass of protein broken down in one minute in mg\text{mg}mg |
|---|---|
| 0.5 | 7.5 |
| 1.0 | 15.0 |
| 1.5 | 22.5 |
| 2.0 | 30.0 |
The technician needs 19.5 mg of protein to be broken down in one minute. Protease solutions with concentrations of 1.2%, 1.3%, 1.4% and 1.5% are available.
Predict which protease concentration should be used.
1.2%1.2\%1.2%
1.5%1.5\%1.5%
1.4%1.4\%1.4%
1.3%1.3\%1.3%
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.