What are the major functions essential to life that proteins provide?

Proteins play several essential functions vital to life, including acting as enzymes to catalyze biochemical reactions, serving as structural components in cells and tissues, and facilitating communication and signaling within and between cells. They also play key roles in the immune response, transporting molecules across membranes, and regulating cellular processes. Additionally, proteins serve as antibodies that protect against pathogens and as hormones that help maintain homeostasis in the body. Overall, proteins are fundamental to virtually all biological processes.