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Which vital function is NOT typically associated with proteins?

  1. Energy storage

  2. Transport substances

  3. Movement

  4. Immune defense

The correct answer is: Energy storage

Energy storage is primarily associated with carbohydrates and fats rather than proteins. While proteins can be used as an energy source, this is not their primary function in the body. Proteins serve crucial roles such as transporting substances through the bloodstream (like hemoglobin transporting oxygen), facilitating movement (muscle contractions involve proteins like actin and myosin), and providing immune defense through antibodies. These functions highlight the diverse roles of proteins in maintaining physiological processes, marking energy storage as a lesser role in the context of protein functions.