Question 24 The data in the table are the results from an investigation measuring enzyme activity using different substrate concentrations - HSC - SSCE Biology - Question 24 - 2008 - Paper 1

To extrapolate the graph for a substrate concentration of 75 µM:

1. Continue the Trend:

   • Extend the line of best fit beyond the last plotted point (45 µM).

2. Estimate Enzyme Activity:

   • By observing the trend, notice that the enzyme activity increases as the substrate concentration increases. The activity should approach a plateau as saturation is reached.

3. Predict Value:

   • Based on the last few points and the trend in the graph, it’s reasonable to predict that the enzyme activity at 75 µM would be approximately 4.5 µM/sec/g. This value indicates continued but diminishing returns on enzyme activity with increasing substrate concentration.