Which of the following describes proteins' impact on metabolic processes?

Proteins play a crucial role in metabolic processes as they are fundamental components of enzymes, hormones, and various cellular structures. Enzymes, which are proteins, catalyze biochemical reactions, thereby facilitating metabolic pathways that transform nutrients into energy and building blocks necessary for growth and repair. Hormones, many of which are protein-based, help regulate various metabolic functions in the body, ensuring that homeostasis is maintained.

In addition to being building blocks for enzymes and hormones, proteins also contribute to metabolic pathways by acting as substrates for various reactions or by influencing the rates of these metabolic processes. Therefore, their essential role in creating and supporting metabolic pathways underscores why proteins are vital for overall metabolism and not merely a secondary aspect of energy use or other limited functions.