Describe5 marksChallenge
A student investigated the effect of temperature on the rate of respiration in yeast using the redox indicator DCPIP (2,6-dichlorophenolindophenol). DCPIP is blue when oxidised and becomes colourless when reduced. A yeast suspension was mixed with DCPIP and the time taken for the blue colour to disappear was measured at five different temperatures. The results are shown in the table.
| Temperature (°C) | Time for decolourisation (minutes) |
|---|---|
| 15 | 24 |
| 25 | 12 |
| 35 | 6 |
| 45 | 10 |
| 55 | 30 |
Describe the pattern shown in the results and explain the observations in terms of the process of aerobic respiration in yeast.