Which of the following functions do proteins have?

Proteins play a crucial role in building and repairing body cells, which makes this function fundamental to their overall significance in biological processes. These macromolecules are composed of amino acids, which serve as the building blocks for tissues such as muscles, skin, organs, and immune cells. When the body undergoes growth, healing, or any form of cellular repair, proteins are vital in synthesizing new cells and tissues.

This function is distinct from other roles that different macronutrients may play, such as carbohydrates in regulating blood sugar levels or serving as a quick source of energy, and fats, which contribute to energy storage. While proteins can provide energy, they are not considered their exclusive or primary function; instead, this role primarily belongs to carbohydrates and fats. Furthermore, proteins do not serve as a source of hydration, as hydration is typically provided by water and electrolytes rather than by any macronutrient.

Therefore, the role of proteins in building and repairing body cells is essential to growth, recovery, and maintaining overall health, highlighting their significance in the diet and physiology.