Question

check your understanding: catalase is an enzyme that functions in human liver cells where the ph is approximately neutral. which of the following graphs best reflects the activity profile of catalase from ph 5 to ph 9?

Explanation:

Enzymes have an optimal pH at which they function best. Catalase functions in a neutral - pH environment (around pH 7 in human liver cells). Its activity will be lower at pH values away from neutral (pH 5 and pH 9). A graph with a peak at around pH 7 and decreasing activity as pH moves to 5 or 9 best represents this. The first graph with a bell - shaped curve shows increasing activity from pH 5 to the optimal pH (around 7) and then decreasing activity from the optimal pH to pH 9, which is consistent with enzyme activity patterns based on pH.

Answer:

The first graph (the one with a bell - shaped curve)