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UNIT 3 Proteins Introduction to Protein. Proteins are essential macronutrients composed of amino acids, which play a crucial role in growth, repair, and maintenance of body tissues. They are often referred to as the “building blocks of life” because they are involved in almost every biological process in the human body. Definition of Protein Proteins are complex organic molecules made up of carbon (C), hydrogen (H), oxygen (O), nitrogen (N),