Which of the following is NOT a function of proteins?

Proteins serve numerous essential functions in the body, and understanding their roles can help clarify why storing energy is not one of these functions. Each of the other options relates directly to the primary roles that proteins play in biological systems.

Building new cells is a critical function of proteins, as they are the building blocks of tissues. Proteins are used to construct cell structures and are crucial for growth, repair, and maintenance of body tissues.

Making enzymes is another vital function, as enzymes are proteins that catalyze biochemical reactions. These enzymes are essential for facilitating various metabolic processes, allowing the body to break down food, synthesize molecules, and regulate physiological functions efficiently.

Regulating metabolic processes also falls under the purview of proteins. Many hormones, which are critical for signaling and regulating various metabolic pathways, are proteins. They help maintain homeostasis by influencing processes like digestion, growth, and energy production.

On the other hand, while proteins can serve as an energy source (in situations where carbohydrates and fats are insufficient), they are not primarily responsible for energy storage. Instead, carbohydrates and fats are the main macronutrients utilized for energy storage in the body. Carbohydrates are stored as glycogen, while fats are stored as triglycerides in adipose tissue