Which of the following describes the function of enzymes?

Enzymes are biological catalysts that significantly increase the rate of chemical reactions in the body. Their primary function is to lower the activation energy required for reactions, allowing them to occur more rapidly and efficiently. This property makes enzymes essential for various metabolic processes, including digestion and cellular respiration.

The other options describe different functions that are not related to the role of enzymes. While structural support is crucial for cells and tissues, this function is typically provided by proteins like collagen or keratin rather than enzymes. Similarly, transporting nutrients is the role of transport proteins and cellular mechanisms, and storing energy is achieved through compounds like glycogen and fats. Thus, the focus of enzymes on accelerating the speed of chemical reactions highlights their critical role in maintaining the life processes of organisms.