Detailed Instructions: 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.
Q: The conversion of methionine to S-adenosyl-L-methionine by Met Adenosyltransferase is the first step of the reaction leading to synthesis of this molecule, and the final step involves ACC-oxidase, an enzyme that is made in the presence of auxins. The first genes encoding a receptor for this molecule were found in Arabidopsis and tomatoes, and plants have a variety of responses including inhibition of stomatal closing and acceleration of fruit-ripening. In bromeliads, exposure to this chemical induces flowering, and it is used as an inhalatory anesthetic in moderate does for humans. For ten points, identify this molecule with formula C2H4, the simplest alkene.
A:
Science