Which statement is false regarding enzyme activity?

The statement regarding enzyme inhibitors enhancing the reaction rate is false because enzyme inhibitors, by definition, decrease the activity of enzymes. Inhibitors can bind to an enzyme and prevent it from catalyzing a reaction, either by blocking the active site where the substrate binds or by altering the enzyme's structure to render it less effective. This reduced ability to facilitate a reaction results in a lower reaction rate rather than an enhancement.

In contrast, the other statements are true. Enzyme activity is indeed influenced by temperature and pH; both factors can affect the shape and function of an enzyme, thus altering its activity. Extreme conditions can lead to denaturation, where the enzyme loses its functional shape. Additionally, enzymes are highly specific for their substrates, meaning they will only catalyze reactions for particular molecules due to their unique active sites that fit specific substrates, much like a key fits into a lock. Understanding these principles is crucial for grasping how enzymes function in biochemical processes.