Enzyme activity is greatly influenced by temperature. As the temperature rises, enzyme reactions usually increase due to greater molecular movements. However, enzymes have an optimal temperature range; beyond this, denaturation may occur, altering the enzyme's structure and rendering it inactive. Each enzyme operates best within a specific range, and deviations from this range can lead to decreased activity or complete loss of function. Thus, maintaining appropriate temperature levels is crucial for enzymes to effectively catalyze reactions.