Supervised experience in organizing, preparing, and teaching biology laboratories. Students are assigned to a specific biology course and will assist the instructor in one laboratory section each week. Grade evaluation will be based on attendance, preparation, teaching ability and specific tasks assigned by the instructor, such as designing a demonstration or experiment to illustrate a biological principle. May be repeated for credit. Prerequisites: Students must be third- or fourth-year biology or natural science majors and/or must obtain consent of the instructor.