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Proteins ABCDEFGHI JKLMNOPQ RSTUVWXYZ ABCDEFGHI JKLMNOPQ RSTUVWXYZ Alphabet Analogy Structure and Function Proteins are groups of Amino Acids that are bonded together by a peptide bond. Contain hydrogen, oxygen, carbon and nitrogen The main function of proteins is to build and maintain tissues. Can also be used for energy but ONLY if carbohydrate and fat stores are depleated. Amino Acids Amino acids are the building blocks of protein. There are 20 different amino acids. 2 types Essential Amino Acids Non-essential Amino Acids Essential amino acids are the acids that you must consume in your diet 8 amino acids Non-essential amino acids are the ones your body can produce 12 amino acids Kinds of Proteins T E - Transport – located in cell membranes Enzymes – break/put molecules together A - Antibodies – help fight diseases C - Contractile – help cells move (flagella) H - Hormones – regulate other molecules (insulin) E - Extra Storage – reserve of metal ions and amino acids (egg whites) R - Receptors – cell communication S - Structural – cytoskeleton, keratin Nutrition Over half of the nutrients in our diet, should be proteins. Sources of proteins: Meat Fish Eggs Nuts Beans