Teacher:In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Teacher: Now, understand the problem? Solve this instance: Transgenic sheep have been engineered to produce this amino acid, necessary for the production of wool. Along with glycine and glutamate, it forms glutathione, a common antioxidant. A variant of it exists containing the element selenium, and its use in dietary supplements raises questions of cannibalism, as a primary source of this amino acid is human hair, where it strengthens the secondary structure of the protein keratin. For 10 points, name this amino acid, whose thiol group when oxidized can bond with another to form a dimer connected by a disulfide bridge.
Student:
Science