Final answer:
Dietary proteins have various functions, including tissue repair, enzyme catalysis, and immune system support, but they are not primarily involved in energy storage.
Step-by-step explanation:
One of the primary functions of dietary protein is not energy storage. Proteins serve as body building units, provide support and protection to various tissues, and transport molecules and ions from one organ to another. They also act as enzymes, catalyzing all chemical reactions in the body.