Integrated Web Site to Accompany Discovering Nutrition, Second Edition

Proteins are sequences of amino acids. There are different amino acids; are essential and are nonessential. and cysteine are both considered amino acids. If your intake of methionine is too low, your body needs cysteine from your diet to free methionine for protein formation. People with lack sufficient amounts of an enzyme that converts to tyrosine. These people must carefully monitor the amount of phenylalanine in their diets to avoid problems such as .

One amino acid is linked to the next by a . When this bond is created, the carboxyl group of one amino acid binds to the amino group of another amino acid. This reaction releases water in the process. An oligopeptide is a chain of amino acids; a polypeptide contains at least amino acids. Acidity, heat, and oxidation can disrupt the chemical forces that stabilize a protein’s shape causing it to .