Which of the following best describes the role of enzymes in metabolism?

Enzymes play a crucial role in metabolism primarily by acting as catalysts that speed up chemical reactions. They lower the activation energy required for reactions to occur, allowing metabolic processes to proceed at a much faster rate. This is essential for maintaining the proper functioning of the body, as many biochemical reactions would occur too slowly under physiological conditions without the presence of enzymes.

The role of enzymes enables the efficient conversion of substrates into products, thus facilitating various metabolic pathways involved in energy production, nutrient breakdown, and other vital functions. Enzymes are specific to the reactions they catalyze, ensuring that metabolic processes are tightly regulated and occur as needed.

In contrast, providing energy for cell processes is more related to the role of metabolites and energy carriers, such as ATP. Acting as substrates for metabolic reactions is contrary to their function, as enzymes facilitate these reactions rather than becoming substrates themselves. Finally, while some substances in the body serve as storage molecules, enzymes do not serve this purpose; instead, they participate actively in facilitating metabolic reactions.