In a series of three experiments, learners explore the basics of biotechnology using self-locking plastic baggies. Each experiment demonstrates a phenomenon or principle of biotechnology. In the first experiment, yeasts will anaerobically oxidize grape sugars to produce ethanol and carbon dioxide. The second experiment demonstrates denaturing protein in milk (cheese-making) and the third experiment uses yeast to leaven flour (bread-making). These experiments "in a bag" allow learners to explore biotechnology in a safe, convenient and inexpensive way. Adult supervision is recommended.