Biology Assess Men 2

Biology Assessment – Interpreting and Evaluating Interpreting: I have presented my results as a jagged line graph. By looking at my graph I can see that my results seem to support my original predictions. At 20°C the height of the foam produced is 19mm, and this increases at 30°C and 40°C, where it reached 33.5mm. However, at 50°C this has fallen by 11mm, and at 70°C it has dropped to only 4mm. This agrees with my predictions because the height of foam increases until the temperature passes 40°C and then drops again. This is because after 40°C the temperature becomes too high and the enzymes become denatured. As the substrate can no longer fit into the active site, the rate of reaction drops. If I kept carrying out the experiment at higher temperatures, it would reach a point where no foam at all was formed. This would be because all of the enzymes had become denatured. Evaluating: Although my results have been accurate enough to prove my predictions, if I was repeating this investigation there are several things I could do differently to achieve even more accurate results. For example, I could take more measurements at each temperature, and then find the average. This would make my averages much more accurate, and so my graph would also be more accurate. Another thing I could change would be to take measurements at more different temperatures, perhaps at 5°C intervals instead of 10°C. This would help me pinpoint the exact temperature at which the activity of the enzyme catalase reached its peak, before beginning to drop again. This would make my conclusions more accurate, and the information presented on my graph would be much more reliable. My first and last repetitions were very similar, with the height of foam recorded at 20°C was the same in each repetition, and at 70°C the difference was one of only 2mm. The largest difference between repetitions was at 40°C, when there was a difference of 7mm between my results. However, despite these differences I believe my results were very accurate and are a realistic portrayal of how enzymes are affected by temperature.