The Structure and Function of Enzymes MODULE 1 MODULE 2 ...

Toothpickase Post laboratory SessionModule 2 Explanation ActivityOverviewThis is a teacher-directed, but student-centered post-lab lesson based on the“Toothpickase” activity. It emphasizes the skills and processes of science.ProcedureStudents complete a data table and two graphs, along with several brief constructedresponse items at the beginning of the post lab. These items serve as the framework toexplain enzyme function. The emphasis should be on their thinking processes as theycomplete the items and the items are reviewed in class.In addition to the problems within the lab, students should be asked to identify analogies.What do the broken toothpicks represent?Answer The broken toothpicks represent the newly formed products.Why were the broken toothpicks placed back with the unbroken ones?Answer The products of the reaction are still in solution. They may interfere withthe chances of an enzyme forming an enzyme-substrate complex. Thisslows down the rate at which the enzyme can work.ClosureTime should be provided for students to ask questions and provide summaries of whatthey have learned.22