To determine which statement is supported by the evidence in the graphs, we need to analyze each option based on the typical behavior of enzymes concerning temperature and pH:
a) The enzyme functions well at a temperature of 35°C and would be active at any pH value.
- This statement would imply that the enzyme has broad pH tolerance, which is often not the case for most enzymes. Additionally, if the graph shows a peak activity at a specific temperature much different from 35°C, this would contradict the claim.
b) The enzyme's activity is greatest at pH 7 and would not be affected by a change in temperature.
- This statement would only be true if the graph shows a clear peak at pH 7 and if temperature changes do not affect the enzyme’s activity, which is unlikely given that most enzymes are sensitive to temperature variations.
c) The enzyme is very active at approximately 42°C and within a pH range of 2 to 6.
- This statement would be supported only if the graph indicated high activity at 42°C and within that specific pH range. If the graphs show significant activity at those levels, this statement could be true, but it is usually unlikely for enzymes to perform well at such low pH and high temperatures.
d) The enzyme works best in a pH range of 6 to 8 and at a temperature of approximately 37°C.
- This option describes conditions (neutral to slightly alkaline pH and a body temperature range) that are typical for many enzymes, particularly human enzymes. If the graph shows maximum activity in that pH range and at around 37°C, this statement would be supported.
Conclusion: Without the actual graphs, if we analyze these options based on common enzyme characteristics, option d is often the most plausible statement to be supported by typical enzyme behavior. If the graphs show maximum activity at a pH of 6 to 8 and around 37°C, it accurately portrays the optimal conditions for many enzymes.