Proteins Sugars Nucleotides. Proteins are one of the three macronutrients, along with fats and carbohydrates, which we get in large amounts from the foods we eat. Proteins are crucial to survival as they perform several functions in the body. Along with water they are the main components of muscles, organs and other tissues. Therefore, they are necessary both to build and to repair tissues. Proteins are also a large component of antibodies, some hormones and enzymes. Since the function of enzymes is to regulate bodily processes, proteins are essentially indispensable in ensuring healthy functioning. Proteins are large molecules which are made from a chain of amino acids. The body is constantly breaking down and building proteins. Proteins are basic constituents in all living organisms. Proteins are sometimes referred to as macromolecular polypeptides because they are very large molecules and because the amino acids of which they are composed are joined by peptide bonds.
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