To determine which statement is supported by the evidence in the graphs, we would need to analyze the specific data and trends presented in those graphs related to temperature and pH levels affecting enzyme activity. Since the graphs themselves are not provided, I will evaluate each statement based on typical knowledge about enzyme activity:
a. The enzyme functions well at a temperature of 35°C and would be active at any pH value.
This statement is unlikely if enzyme activity is usually dependent on both temperature and pH, meaning that not all pH values would allow for optimal enzyme activity.
b. The enzyme is very active at approximately 42°C and within a pH range of 2 to 6.
This statement could be true if the graphs show high enzyme activity at these conditions, but 42°C is often near the denaturation point for many enzymes, making this less likely unless this enzyme is exceptionally heat-stable.
c. The enzyme's activity is greatest at pH 7 and would not be affected by a change in temperature.
While many enzymes do have optimal activity at around neutral pH (7), it is generally not the case that enzyme activity is unaffected by temperature.
d. The enzyme works best in a pH range of 6 to 8 and at a temperature of approximately 37° C.
This statement is likely to be supported if the graphs indicate optimal enzyme activity in this range, as many human enzymes do function best around 37°C and within a neutral to slightly basic pH.
Without the graphs to verify the specific data, option d is often a common conclusion in studies of enzyme activity and meets typical conditions for many enzymes. Thus, it is likely to be the supported statement if the graphs display this information.